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.
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.
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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