讲解文本：
充话费英文怎么说?
top up 充值
My phone is out of credit，I have to top up it .
我手机没钱了，得去给手机充值。
I don’t have any money on my phone. I have to put 100 yuan on it.
我手机没钱了，得去给手机充100元。
疯狂练习吧!
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