转柄上发条的

例句：

1. 1. The clock has a mechanism that allows you to wind the spring.
   这台钟表有一个机制，可以让你拧动发条。
2. 2.The old clock had a broken spring and needed to be replaced.
   旧钟表的发条断了，需要更换。
3. 3. The mechanics of the clock are designed to ensure that the spring is always wound up.
   钟表的设计原理是确保发条始终处于紧绷状态。