研究发现，当灯亮着时，身体会放慢分泌荷尔蒙褪黑素的速度或停止分泌，要远离任何光源，甚至是正在充电的智能手机发出的蓝光。

Research has found that the body will slow or stop it with light on, get away from any light, even the blue light from your charging smart phone.

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只有当你的快门速度超过普通同步速度时，相机和闪光灯才会开启高速同步。

Your camera and flash will only use it if you are shooting beyond the normal sync speed.

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同样，当你在室外跑步时，因为不同的因素你是以不同的速度在跑步，比如风，山丘，交通灯，和变化的天气。

Also, when you're running outside, you're running at different speeds because of different factors, such as wind, hills, traffic lights, and changing weather conditions.

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