Sorry, I already have a previous appointment.
对不起，我已经有一个先前的约会了。
He declined my invitation because of a previous appointment.
因另有约会在先，他谢绝了我的邀请。
Our manager has a previous engagement (appointment) at 4 'clock this afternoon.
我们经理在今天下午四点已经有预约了。
Our manager has a previous engagement (appointment) at 4 'clock this afternoon.
我们经理在今天下午四点已经有预约了。
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