Undersoil
n. 底土, 下层土
🗣️ 情景例句
When you're ready to get off, remember to press the button near your seat.
当你要下车时，记得按你座位旁的按钮。
How much is the admisssion fee?
入场费要多少钱？
supplying the rocket fuels for its ships,
作为航天飞船的燃料。