big gear

• 大齿轮

big gear的用法和样例：

例句

1. This large gear turns the small one.
   这个大齿轮带动那个小齿轮。
2. If the big gear did not engage with the small one, the machine would refuse to work.
   如果大齿轮与小齿轮不相啮合的话，机器就不会工作。