Insects are fairly low down (on) the food chain.

在食物链中，昆虫是相当低的一级生物。

《牛津词典》

This poses a threat to agriculture and the food chain, and consequently to human health.

这会对农业和食物链造成威胁，由此而危及人的健康。

《牛津词典》

The effect was to disrupt the food chain, starving many animals and those that preyed on them.

后果是打断食物链，使许多动物和捕食它们的动物饿死。

《柯林斯英汉双解大词典》

Sharks play an important role in the food chain.

VOA: special.2009.04.03

Redfish will eat that and feed on it. Sheephead,speckled trout, it is part of the food chain."

VOA: standard.2010.05.04

"It could be taken up by crustaceans like shrimp crabs, things like that which are the base of the food chain and that could be passed up to fish and then mammals and the toxins could be concentrated and that could be harmful to animals that feed on these smaller organisms."

VOA: standard.2010.05.09

Nitrogen, a basic organic compound, is then simply incorporated back into the food chain.

FORBES: Oysters Are Back In New York City Waters

Why not move up the food chain, acting, in effect, as a factor for MCI?

FORBES: Aggressive Accounting

Of these, six went to France, raising concerns they may have entered the food chain there.

CNN: UK arrests, French investigation in horse meat scandal