这位议员定期与选民会面，了解他们的需求。

The congressman regularly meets with his ___constituents to understand their needs.

牛奶的主要成分包括蛋白质、脂肪和乳糖。

The main ___constituents of milk are protein, fat, and lactose.

这位议员定期与她的选民会面，听取他们的意见。

The congresswoman meets regularly with her ___constituents to hear their concerns.