肥胖是原发性高血压的第一危险因素。
Obesity is the most important risk factor of primary hypertension.
我们称之为余震，有时比第一次地震更危险。
We call them aftershocks and they sometimes can be more dangerous than the first earthquake.
颤抖通常是寒冷暴露危险的第一迹象。
Shvering is usually the first sign of dangerous cold exposure.
曾七次登上世界最高峰的纳姆格亚尔 夏尔巴说：“这是我们第一次在死亡区这么高的地带清理垃圾，难度很大，也很危险。”
This is the first time we are cleaning at that height, in the death zone.
第一种危险是真实存在的，而且正在上升。
她第一次意识到她的形势处于潜在的危险中。
For the first time she realized the potential danger of her situation.
第一个原因是，骑电动自行车可能带来很大的潜在危险。
The first reason is that riding electrical bikes can bring about much potential dangers.
根据第一印象作判断是很危险的。
但这并不简单，工作环境十分危险，你必须非常非常小心，做任何事都必须安全第一。
But it is not that simple, it is a very dangerous work environment and you have to be very very careful, everything has to be done with safety as the first priority.
第一部分，危险责任的概念界定。
第一，我们要排除这种具有系统性危险的金融机构。
So we have to first get rid of the systemically dangerous institutions.
他是第一个发觉这危险的人。
这也许是凯文长这么大第一次感到有些危险。
Maybe it was time Kevin started to take some risks with his life.
如果海平面上升，荷兰会成为第一个处于危险中的国家。
If the sea level rises, Holland may be the first country at risk.
这两种危险中的第一个可以说就是太过于艺术化了。
处理的第一步是进行危险度分层。
第一章为“英国传统禁止双重危险规则的主要内容”。
The first chapter discusses the content of the rule against double jeopardy in English.
当危险发生时，第一件事我们要做的就是躲藏起来。
When danger occurs, the first thing we need to do is to duck.
当危险发生时，第一件事我们要做的就是躲藏起来。
When danger occurs, the first thing we need to do is to duck.
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