A third presidential candidate emerged to mount a serious challenge and throw the campaign wide open.

第3位总统候选人上场郑重发出挑战，令这次竞选充满悬念。

《柯林斯英汉双解大词典》

Van Persie knows Arsenal cannot afford another defeat if they are to mount a serious challenge for the Premier League trophy.

范佩西认为如果他们还想对英超冠军锦标发起冲击的话，他们是再也负担不起一场失利了。

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But analysts caution that right now the renminbi is far from ready to mount a serious challenge to the United States dollar as the world's leading reserve currency.

但是分析人士警告说，现在的人民币还远没有准备好挑战美元这一世界第一储备型货币的地位。

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However, he said they are yet to mount a serious challenge in the corporate market where premium brands are most coveted.

CNN: Made-in-China superyachts reflect changing tide of economy

She now looks set to mount a serious challenge for gold at next year's world championships and the 2004 Olympics in Athens.

BBC: Kluft shines in heptathlon

Renault are hoping the R29 will allow Alonso and team-mate Nelson Piquet Jr to mount a serious challenge to front-runners McLaren and Ferrari.

BBC: Alonso upbeat over Renault hopes