food chain

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。

2.Class action lawsuits are now being brought against fast food chains for their misrepresentative and misleading marketing techniques.

现在有人因为快餐连锁店隐瞒事实和导消费者的行销手法而提出集体诉讼。