释义：
have an appointment 有约
appointment 不是朋友之间的约定，而是在医院（美容院）等场所的预约。have an appointment 后面加 with somebody 就表明约好的对象，也可以用 to+动词表示预约的内容。
例句：
I have an appointment with Mr. James.
我之前约好了詹姆斯先生。
I have an appointment to see Dr. Kim.
我之前约好了金大夫。
I'm afraid I have another appointment.
抱歉，我已经有约了。
对话：
A: What's the rush?你怎么这么着急？
B: I have an appointment. And it's very important.
我有个约会。而且非常重要。
