... wait in line排队等候 keep someone waiting让某人等待 wait up不睡而等候 ...
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You might at least phone if you know you're going to keep someone waiting.
如果你知道你会让别人等待，你至少可以打个电话。
youdao
It's not polite to keep someone waiting when you've placed the call.
如果电话是你打的，让对方久等是不礼貌的。
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