例句與造句

1. -- When a heater's limit switch trips because the heater has become too hot, the heater needs to stay off until a person manually turns it on.
2. The drive system has limit switches-so I can move all the way down / left / in until the limit switches all trip-then move up / right / out until the other limit switches trip-and I'll know how many steps there are between the two limit switches.
3. It's difficult to find switch trip in a sentence. 用switch trip造句挺難的