unstable idling的用法和樣例：
例句
- A fuel too volatile for the outside temperature, or a missing restrictor in the vapor line, will also cause improper engine idling.
就外界溫度而言，燃油的揮發性過高，或蒸汽管路中的節流器有故障，也會使發動機的怠速不穩。 - Another cause of improper engine idling can be dirty or plugged air filter in the bottom of the charcoal canister.
發動機怠速不正常的另一個原因是活性炭罐底部的空氣濾清器臟污或被堵塞。
