Definition: to stop working normally, or to become weaker Level: B2
如果刹车失灵，那会很危险。
It would be dangerous if the brakes ___fail.
如果关键部件失灵，整个系统可能会关闭。
If a critical component ___fails, the entire system might shut down.
停电期间，旧发电机失灵，使情况恶化。
The old generator ___failed during the blackout, worsening the situation.
