饮用未经处理的水可能会导致大肠杆菌感染。

Drinking untreated water may lead to ___E.coli infection.

科学家们利用大肠杆菌研究基因表达，因为它的基因组已被完全测序。

Scientists use ___E.coli to study gene expression because its genome has been fully sequenced.