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。
And I think this is a serious challenge.
我认为这是一个严重的挑战。
Mobile devices present a serious challenge.
移动设备面临巨大挑战。
This can make parenting a serious challenge.
这对家长来说是个很大的挑战。
Substance abuse is a serious challenge for our Nation.
滥用是我们的国家面临的严重的挑战。
Food prices pose a serious challenge to society at large.
全社会面临这食品价格的严峻挑战。
Which make a serious challenge to the energy and enviroment.
这就对我国能源和环境提出了严峻的挑战。
Disaster is a serious challenge that the mankind is faced with.
灾害是人类面临最严重的挑战。
China faces a serious challenge with the number of a (H1N1) infections.
随着甲流感染人数的上升，中国正面临着严峻的挑战。
But getting a practical, reliable flying car off the ground has been a serious challenge.
不过，想要造出实用又安全的飞行汽车一直是个严峻的挑战。
Data security and privacy security in cloud storage pose a serious challenge to data users.
云存储中的数据安全及隐私安全问题给数据用户提出了严峻的挑战。
The possibility of making progress would be a serious challenge even if negotiations began tomorrow.
即便双边会谈明天就开始，对双方而言，取得进展的可能性都是一个严峻的挑战。
Water, however, presents a serious challenge for fish and fishermen when it comes to vision and color.
但是水当谈到视觉和颜色对鱼类和渔民仍然是一个严重挑战。
The global emergence of the population question poses a serious challenge to many countries and regions.
人口问题在全球范围出现，成为许多国家和地区面临的严重挑战。
But we can be fairly sure that a "hard" Brexit will pose a serious challenge to art and culture in the UK.
但我们可以相当确定的是，“硬性”的脱欧将对英国的艺术和文化构成巨大挑战。
The United States has expressed concern about an arms build-up in Venezuela saying it poses a serious challenge to stability.
美国对委内瑞拉的武器积累表示担忧。美国表示，这对稳定提出了一个严峻的挑战。
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。
Viruses and cancer cells because of the significant differences between the radioimmunotherapy for HIV face a serious challenge.
由于病毒与癌症细胞之间差别很大，将放射免疫治疗用于HIV面临很大挑战。
The increasing development of the higher vocational education offers a serious challenge to the teaching quality of the higher vocational education.
高等职业教育的迅猛发展，对高职教育教学质量提出了严峻挑战。
It presents a serious challenge to commercial software by its rapid worldwide spread. Also, it has a significant impact on the future of digital era.
它在世界上的蓬勃发展对传统的商业软件构成了一定的挑战，也强烈影响着数字时代的未来。
In the globalization of today, how to carry on the valid protection and development of the paddy rice culture is a serious challenge that we are facing.
在全球化的今天，如何对稻作文化和遗产进行有效的保护和开发，是我们面临的严重挑战。
And for those of us who fly more than a couple of time zones from home-particularly those who fly eastward around the globe-jet lag can be a serious challenge.
对于经常从家中出发，飞越时区的我们来说——尤其是那些飞往地球东方的人——时差综合症可能成为很严重的挑战。
Although BMW's current operating performance of the global peer envy, but because of their lack of foresight before, and is about to face a serious challenge.
虽然宝马公司目前的经营业绩令全球同行羡慕，但是他们由于之前的缺乏远见，而即将面临一个严峻的挑战。
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。
Scientists like Michael Can at the U. S. Geological Suwey who believe oceans once covered much of Mars face a serious challenge from the Global Surveyor studies.
像美国地质勘测局的科学家迈克尔·卡尔，他认为海洋覆盖了火星的大部分地区。他的观点现在也面临着来自全球监测机构研究结果的挑战。
Scientists like Michael Can at the U. S. Geological Suwey who believe oceans once covered much of Mars face a serious challenge from the Global Surveyor studies.
像美国地质勘测局的科学家迈克尔·卡尔，他认为海洋覆盖了火星的大部分地区。他的观点现在也面临着来自全球监测机构研究结果的挑战。
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