unstable idling的用法和样例：
例句
- A fuel too volatile for the outside temperature, or a missing restrictor in the vapor line, will also cause improper engine idling.
就外界温度而言，燃油的挥发性过高，或蒸汽管路中的节流器有故障，也会使发动机的怠速不稳。 - Another cause of improper engine idling can be dirty or plugged air filter in the bottom of the charcoal canister.
发动机怠速不正常的另一个原因是活性炭罐底部的空气滤清器脏污或被堵塞。
