duct|ducts

医生检查了他的泪腺管是否堵塞。

The doctor checked if his tear ___duct was blocked.

医生检查了泪腺导管是否堵塞。

The doctor checked if the tear ___ducts were blocked.

厨房的排气管堵住了，我们需要清理一下。

The kitchen exhaust ___duct is clogged and needs cleaning.