Carry your cell phone and keep it charged — and make sure to tell your friends where you're going and when you'll be back.
带着手机并充好电，告诉你的朋友你去哪并注意安全。
Pay attention to your phone's battery indicator, so that you know how much power your cell phone has and if the cell phone needs to be charged.
注意你的手机电池指示，以便经常了解手机里面还剩多少电，以及你的手机是否需要充电。
Pay attention to your phone's battery indicator, so that you know how much power your cell phone has and if the cell phone needs to be charged.
注意你的手机电池指示，以便经常了解手机里面还剩多少电，以及你的手机是否需要充电。
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