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词汇 food chain
释义
noun
Insects are fairly low down (on) the food chain.在食物链中,昆虫是级别相当低的生物。 Pesticides work their way up the food chain from plants, through insects and birds to humans. These guys are at the top of the food chain when it comes to earnings.They are focused on ensuring that contaminated crops do not enter the food chain.
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