3 sentences

1. 他用铁链把大门锁上了。

   tā yòng tiě​liàn bǎ dà​mén suǒ​shàng le.

   He locked the gate with an iron chain.

   Source: Dong Chinese Dictionary

2. 他用铁链把自行车链在栏杆上。

   tā yòng tiě​liàn bǎ zì​xíng​chē liàn zài lán​gān shàng.

   He chained his bicycle to the railing with an iron chain.

   Source: Dong Chinese Dictionary

3. 这个铁链是由一个个小环扣起来的。

   zhè gè tiě​liàn shì yóu yī gè​gè xiǎo huán kòu qi​lai de.

   This iron chain is made of small rings linked together.

   Source: Dong Chinese Dictionary