发音一致，都发[ʌ]音。
We often slept under the stars.
我们经常在夜空下露宿。
The boat was going under fast.
小船正迅速下沉。
She buried it under some leaves.
她把它埋藏在一些树叶下。
The city is under enemy control.
那座城市现处于敌人的控制之下。
They move under cover of darkness.
他们在黑夜的掩护下行进。
Duck is high in protein.
鸭肉的蛋白质含量很高。
As soon as he saw her passing by, he ducked his head.
他一看到她经过，就赶忙低下头。
We should duck out before it gets dark.
我们得快点离开，不然天就要黑了。
