3 sentences

1. 所有金属遇热膨胀，遇冷收缩。

   suǒ​yǒu jīn​shǔ yù rè péng​zhàng, yù lěng shōu​suō.

   All metals expand with heat and contract with cold.

   Source: AI Challenger 2017

2. 收缩你的下巴。

   shōu​suō nǐ de xià​ba.

   Tuck your chin.

   Source: OpenSubtitles

3. 我身体的每一块肌肉都收缩了。

   wǒ shēn​tǐ de měi yī kuài jī​ròu dōu shōu​suō le.

   Every muscle in my body contracted.

   Source: CCMatrix