regular shackle block

例句：

1. 1.The regular shackle block is designed to securely fasten the door.
   这个常规锁块设计用来牢固地固定门。
2. 2. The engineer used a regular shackle block to reinforce the structure.
   工程师使用一个常规锁块来加固结构。
3. 3. The regular shackle block was a critical component of the security system.
   这个常规锁块是安全系统的关键组成部分。