gear box

汉语翻译

英语解释：

名词 gear box:

1. the shell (metal casing) in which a train of gears is sealed
   同义词：gearbox, gear case

例句：

1. The rate of the machine moved up sharply because of changing a big gear box.
   由于换了一个大齿轮箱这台机器的速度大大提高了。