1 sentence for 离不开 (lí​bu​kāi — indispensable)

1. 鱼儿离不开水，就像孩子离不开母亲一样。

   yú r lí​bu​kāi shuǐ, jiù xiàng hái​zi lí bù kāi mǔ​qīn yī​yàng.

   Fish cannot live without water, just as a child cannot do without its mother.

   Source: Dong Chinese Dictionary