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重点讲解：
1. Who's that?
电话用语，询问对方是谁。
Who's that(speaking / calling)? / Who's speaking? / May I ask who's (that) calling?也表达相同意思。
eg. A:Hello! Miss Green's office. Who’s that speaking? 你好。格林小姐办公室。请问你是谁？
B：Hello, this is Michael. 你好，我是迈克尔。
2. put down
放下；记下
eg. She put down the phone, sighed, and shook her head sadly.
她放下电话，叹着气，惋惜地摇了摇头。
eg. I had prepared for the meeting by putting down what I wanted from them.
我已为会议做了准备，写下了我想从他们那里得到的东西。
