During a recent speech on the campaign trail, he was interrupted by hecklers.

在最近的一次竞选巡回演讲中，他被诘问者打断了。

《柯林斯英汉双解大词典》

Mr Cameron’s mood on the campaign trail is mixed.

卡梅隆先生竞选之旅的心情是复杂的。

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Mr Tsvangirai was detained several times on the campaign trail.

茨万吉拉伊先生在竞选过程中数次被逮捕。

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Last week Paul Krugman made sport of a Mitt Romney malapropism on the campaign trail.

FORBES: Mitt Romney Is No Keynesian

So far, Palin has taken no questions from reporters traveling with her on the campaign trail.

CNN: Bill Clinton predicts big win for Obama

John Edwards, Richardson remains a long-shot candidate, and he has acknowledged that on the campaign trail.

NPR: Richardson Makes His Bid Official, in Spanish