middle-of-chain

例句：

1. 1.The chain is the middle of the necklace.
   项链的中间是链条。
2. 2. The middle of the road is the safest place to cross.
   路中间是最安全的过马路地点。
3. 3. The middle of the sentence is where the action happens.
   句子中间是事情发生的地方。