4 sentences

1. 政府最近收紧了签证政策。

   zhèng​fǔ zuì​jìn shōu​jǐn le qiān​zhèng zhèng​cè.

   The government has recently tightened its visa policies.

   Source: Dong Chinese Dictionary

2. 银行已经收紧了信贷政策。

   yín​háng yǐ​jīng shōu​jǐn le xìn​dài zhèng​cè.

   The bank has tightened its credit policy.

   Source: Dong Chinese Dictionary

3. 收紧背部肌肉。

   shōu​jǐn bèi​bù jī​ròu.

   Tighten your back muscles.

   Source: OpenSubtitles

4. 他收紧了手中的勒，马儿慢慢地在集市中停了下来。

   tā shōu​jǐn le shǒu zhōng de lè, mǎ r màn​màn de zài jí​shì zhōng tíng le xià​lai.

   He tightened the reins in his hand, and the horse slowly came to a halt in the marketplace.

   Source: Dong Chinese Dictionary