Polyanhydrides are one kind of biomaterial with characteristics of surfacedegradation and good biocompatibility.
聚酸酐是一类具有表面降解特性的生物医用高分子材料，具有良好生物相容性。
2
Concerns include the degradation of surface and groundwater owing to poultry waste nutrients and pathogenic microorganisms.
令人担忧的问题包括家禽粪便养分和病原微生物造成的地表水和地下水退化。
3
The results showed that UV radiation mainly led to crystal destruction and molecular degradation on the surface and recrystallization on the interior part of the sample.