农夫每天早晨都会给马槽加满清水。

The farmer fills the ___trough with fresh water every morning.

农民们用木槽给牲畜喂水。

The farmers used a wooden ___trough to water the animals.

这次经济低迷预计将持续到明年第一季度。

The economic ___trough is expected to last until the first quarter of next year.

小船在山丘间的波谷中穿行。

The boat sailed through the ___troughs between the hills.