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...their expulsion from the digestive tract.是什么意思？

...their expulsion from the digestive tract.

它们被从消化道排出

相关词汇
their expulsion from the digestive tract

their

pron. 他（她，它）们的，在提及性别不详的人时，用以代替 him 或 her；

expulsion

n. 驱逐，开除，排出，喷出；

from

prep. （表示时间）从…，（表示原因）因为，（表示来源）来自…，（表示分离）与…分离[隔开]；

the

art. 指已提到的人（物），指说话人与听者已知的人（物），用于独一无二的事物前，与形容词最高级和序数词连用；

digestive

adj. 消化的，助消化的；n. 消化剂；

tract

n. 大片土地，（神经纤维的）束，小册子，<古>一段时间，长时间；
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