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1.They copy the real function or duties of the human stomach and intestine, moving when breaking down food.
break down 分解；发生故障；失败；毁掉；制服
Talks have broken down over the disputed territory.
对有争议的领土问题的谈判破裂了。
Their car broke down.
他们的车抛锚了。
n. 功能，函数，职务，重大聚会
vi. 运行
