time-saving devices

• 省时装置

time-saving devices的用法和样例：

例句

1. Throughout the history of gyro testing on servo runs, these timers have proven irreplaceable for backup data behind far more complex timing devices.
   从整个伺服运转的陀螺试验过程来看，证明不能用后来更复杂的记时装置代替这种记时器来得到辅助数据。