2 sentences for 需 (xū — necessity)

1. 我们不需要你的帮助。

   wǒ​men bù xū yào nǐ de bāng​zhù.

   We don't need your help.

   Source: OpenSubtitles

2. 按需分配是这个系统的核心原则。

   àn xū fēn​pèi shì zhè gè xì​tǒng de hé​xīn yuán​zé.

   Distribution according to need is the core principle of this system.

   Source: Dong Chinese Dictionary