如果客人无法准时到达，需要给男女主人打电话说明原因，并告知何时能到。

When the guest cannot come on time, he calls his host or hostess on the telephone, gives the reason, and tells at what time he can come.

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建议问候完后补充说明自己打电话的原因。

Starting with a "Hello" and adding a reason for the call is good.

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