bottomless

adjective2 搭配平均频率: 5.8

无底洞

Refers to a very deep hole that appears to have no bottom, often used metaphorically for an endless supply or demand.

指似乎没有底的洞,常用于比喻。

无底潭

Refers to a body of water, like a swimming pool or natural pond, that is extremely deep.

似乎没有底的水潭;极深。