xī chóng gāng shì biǎn xíng dòng wù mén de yí ge zhòng yào fēn zhī, bāo kuò duō zhǒng jì shēng rú chóng

吸虫纲是扁形动物门的一个重要分支，包括多种寄生蠕虫。

Trematoda is an important branch of the flatworm phylum, including many parasitic worms.