automatic gear的用法和样例：
例句
- We now consider it to be the primordial automatic device because it held the first breath of lifelikeness in a machine.
而我们现在之所以把它看成是自动装置的鼻祖，是因为它在一个机器装置中成功地把握到了生命之为生命的第一次呼吸。 - Cranking-motor controls have varied from a simple foot-operated pedal to automatic devices that close the cranking-motor circuit when the accelerator pedal is depressed.
控制起动电机的方式已从一个简单的脚踏板改为压下加速踏板即可自动接通起动电机电路的自动装置。
