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！