Noun:

1. the aggregate of small plant and animal organisms that float or drift in great numbers in fresh or salt water

plantn.植物；工厂；设备；设施v.种植；设立；建立；安插；栽赃plankn.厚板；支撑物；政纲条目vt.铺板；用力放下；<口>立即付钱planktont浮游个体planktonicadj.浮游的plankton net浮游生物网plankton tow浮游拖网Planktoniellan.漂流藻属(圆筛藻科)plankton trap浮游生物采集器plankton pump浮游生物泵plankton pulse浮游生物消长plankton bloom浮游生物水花planktonophage食浮游生物者

1. 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。