They plan to challenge the constitutionality of the law.

他们计划挑战法律的合宪法性。

《柯林斯英汉双解大词典》

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I intend to challenge the legitimacy of his claim.

我打算对他声称的是否正确提出质疑。

《牛津词典》

Lawyer Paul Achitoff of the organization Earthjustice said: "We do expect to be able to challenge that decision before the district court."

VOA: special.2011.02.15

As with the passage on the falling of the leaves there's a kind of elegiac tone that works to undo, or at least to challenge, our theological certainty.

在描写落叶的段落里,有一种挽歌式的腔调，似乎要抹掉，至少是挑战神学上的确定性。

耶鲁公开课 - 弥尔顿课程节选

So it was an opportunity for them to challenge themselves.

对他们来说,这是挑战自我的机会。

麻省理工公开课 - 媒体、教育、市场课程节选

Nuance equally might just push out a standalone product to challenge Google Now and Siri.

FORBES: With Swype, Nuance Begins?Quest To Process What We Say -- Everywhere

Nevertheless, he seems more likely than President Obama to challenge the scandalous federal tax system.

FORBES: The Proper Post-Election Agenda: Cut Spending, Then Taxes

The club's chairman John Radford said he wanted to challenge for promotion again next season.

BBC: Mansfield Town celebrates Football League return