重点讲解：
1. used to do sth. 过去常常；过去曾；
She used to enjoy a healthy and active life as other happy children but a disease has snatched away all that she used to have.
她曾和其他快乐的孩子一样健康活泼，但是一场病夺去了一切。
2. depend on 取决(于)；有赖(于)；
Whether or not you qualify for a loan will depend on your financial circumstances.
你是否有资格申请贷款取决于你的经济状况。
3. be good at 擅长的；精通的；能干的；
I am not good at singing. I'm here just to make up the number.
我不会唱歌，我在这儿只是滥竽充数。
4. convert into (使)改变；更改；(使)转变；
I need to convert this list into XML.
我需要将这张列表转换成XML。

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