on the trail of sb 追踪某人或某事
The police are still on the trail of the escaped prisoner.
警方仍在追捕逃犯。
It had passed the redskins, who were now on the trail of the other pirates.
它经过了现在正在追踪其他海盗的红皮肤印第安人。
Regulators are eager to show they are on the trail of the wrong-doers.
监管者正竭力展示他们是如何同那些违规者斗争的。
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