Plankton is at the bottom of the marine food chain. 浮游生物处于海洋食物链的最底层。
Ultraviolet radiation may also damage marine life by killing one- celled plants called phytoplankton,which form the base of the ocean's food chain. 紫外线辐射还可以通过杀死单细胞的浮游植物来破坏海洋生命，这种浮游植物是构成海洋食物链的基础。
