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1·She beat off a challenge to her leadership.

她战胜了对她的领导地位的挑战。《牛津词典》

2·The chairwoman is up against the greatest challenge to her position.

女主席面临她职位的最大挑战。《柯林斯英汉双解大词典》

3·Another challenge to language survival is television.

电视是语言存活下来的另一个挑战。

4·On March 12, 1829, Oxford sent a challenge to Cambridge first.

1829年3月12日，牛津首先向剑桥发出挑战。

5·You might also design an adventure challenge to train young volunteers.

你也可以设计一个冒险挑战来训练年轻的志愿者。

6·The challenge to Internet advertisers is to create ads that audience members remember.

互联网广告商面临的挑战是，如何制作出让观众印象深刻的广告。

7·In a recent study, Stephen Saunders Webb has presented a formidable challenge to this view.

在最近的一项研究中，斯蒂芬·桑德斯·韦伯对这一观点提出了严峻的挑战。

8·As yet a challenge to explain the cause-and-effect relationship between sleep and nutrition, there may be a third factor that impacts both of them.

要解释睡眠和营养之间的因果关系，还有一个挑战，那就是可能有第三个因素对它们两者都有影响。

9·It's as yet a challenge to explain the cause-and-effect relationship between sleep and nutrition. There may be a third factor that impacts both of them.

迄今为止，解释睡眠和营养间的因果关系仍是一个挑战。可能存在第三个因素影响这两者。

10·It was a direct challenge to the president's authority.

这是对主席权威的直接质疑。《牛津词典》