在极端天气下对于未做好准备的任何人来说，严寒中身体的暴露可使室外活动很不舒服甚至更危险。
Cold exposure can make outdoor activity uncomfortable or even dangerous for anyone unprepared for extreme weather.
我们一直认为环境因素，比如工作过度、缺少室外活动，是导致近视的原因，但此前我们一直不知道人们的眼睛是怎么近视的。
While ewe believe that environmental risk factors such as a lot of close work and lack of outdoor activity are implicated, we have not previously understood how people become short-sighted.
环境也很好，空气没有净化室外活动比较多。
The environment their was good as well. Less air pollution made it easier to carry out outdoor activity.
第三，空调开机1 - 3小时后，最好关一段时间，打开窗户呼吸新鲜空气，或者每隔1小时到室外活动一下。
Third, air conditioning boot 1-3 hours later, had better close a period of time, open the window a breath of fresh air, or every 1 hour to arrive outdoor activity once.
第三，空调开机1 - 3小时后，最好关一段时间，打开窗户呼吸新鲜空气，或者每隔1小时到室外活动一下。
Third, air conditioning boot 1-3 hours later, had better close a period of time, open the window a breath of fresh air, or every 1 hour to arrive outdoor activity once.
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