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Through the lens of cultural memory, this article explores the relationships between the representation of cultural memory and the construction of ethnic cultural identity in Toni Morrison's A Mercy. I argue that in the novel, Morrison highlights and manipulates three media of cultural memory: the architecture, the inscription, and the body, to interrogate and challenge the validity of numerous historical monuments and museums in America that are eviscerated of their complicity and function as tools in the atrocity of instituting slavery. To externalize his values, White colonizer Jacob builds a superfluous mansion, which, with the slave trade involved, actually serves as a profane monument to the slavery culture. To highlight the invalidity of the White cultural memory, Morrison crafts Florens who inscribes in the mansion the collective traumatic memory of the African female slaves, deforming the secular memorial from within. In the same fashion, culturally traumatized, Native American Lina adulterates the White culture by insinuating into it the Indigenous Indian cultural fragments and by performing the remolded Indigenous Indian culture, she sediments it into her body. By historicizing the issue of cultural memory in A Mercy, Morrison invites the reader to reconsider what makes a true American cultural memory.

The bilateral relationship between the EU and China has a tendency toward growth in recent years. At present, China's economic development is at a critical transition period for deepening reform in the economic structure. The economic and trade cooperation with the countries of the European Union has a significant influence for the stability of trade development and economic growth. Therefore China tries to expand cooperation and eliminate the issues and difficulties that exist, it will more often to promote cooperation between the two parties towards deeper into various cooperative areas. ; La relación bilateral entre la Unión Europea y China tendrá una tendencia hacia el crecimiento en los últimos años. En actualidad, el desarrollo económico de China está en un periodo crítico de transición para acelerar sus reformas en las estructuras económicas. La cooperación económica y comercial con los países de la Unión Europea tiene una influencia significativa para la estabilidad del desarrollo comercial y el crecimiento económico, y por este motivo China trata de hacer esfuerzos en ampliar las cooperaciones y eliminar problemas y dificultades que existen, así pues va a colaborar con los miembros en la Unión Europeo con más frecuencia y para promover la cooperación entre ambas partes sobre todo en diversas áreas.

At present, new coronavirus pneumonia (COVID-19) is circulating worldwide. The pathogen of this coronavirus pneumonia is named SARS-CoV-2. The virus has a long incubation period and is highly contagious. There is currently no specific targeted drug treatment. The focus of anti-epidemic work should be more on prevention and control while cutting off the virus transmission route while treating infected patients, and protecting healthy people. In order to protect the safety and health of the Chinese citizens and to maintain the safety of world public health, the Chinese government and people have made unprecedented efforts to control the epidemic. Many people in the international community have joined in limiting the spread of COVID-19. This article combines the development of COVID-19 epidemic situation in Wuhan, the relevant prevention and control measures of the Wuhan government and local health authorities to share Wuhan's experience on control the cluster epidemic and provide new suggestions and ideas for epidemic prevention and control.

Abstract
Background
The drastic change in an ecosystem as a threshold phenomenon caused by abrupt changes in environmental conditions is a focus of current ecological research. However, the study of ecological thresholds has generally been limited to estimating the threshold values of single factors. Using eDNA metabarcoding technology, we collected zooplankton data from Baiyangdian Lake, the largest freshwater lake in the North China Plain, to explore the zooplankton community distribution characteristics and the relevant environmental factors. We used Threshold Indicator Taxa Analysis (TITAN) to determine the thresholds of key environmental factors and to identify the factors influencing biological diversity.

Results
By comparing previous studies, we found that the zooplankton community composition based on eDNA metabarcoding was similar to that based on morphological methods, and that the data could be used to estimate ecological thresholds and assess risk conditions. Temperature (T), electrical conductivity (EC), and turbidity were the major environmental factors affecting the zooplankton community structure. The composition and structure of zooplankton communities in rivers and lakes were significantly different due to the influence of specific environmental factors. The results of TITAN analysis showed that there were different indicator species for T and EC in rivers and lakes. The protection thresholds of zooplankton in rivers were T = 19.0 °C and EC = 795 μS/cm, whereas the protection thresholds of zooplankton in lakes were T = 14.3 °C and EC = 1920 μS/cm. The overall values for the Baiyangdian watershed were T = 15.5 °C and EC = 1073 μS/cm. Compared with the field monitoring results, approximately 50% of the water quality index values at the sampling points in the Baiyangdian watershed exceeded the negative response threshold, indicating that Baiyangdian Lake was disturbed.

Conclusions
The validity of eDNA technology in biodiversity analysis was confirmed by the zooplankton community data from Baiyangdian Lake. The ecological thresholds derived by combining eDNA technology with Threshold Indicator Taxa Analysis (TITAN) are beneficial to the biological conservation of the region.