When we enter a country, we have to get through customs first.

当我们进入一个国家时，我们必须先通过海关。

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All the luggage is to be examined when you enter the customs.

进入海关时所有的行李都要检查。

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All the luggage is to be examined when you enter the customs.

进入海关时所有的行李都要检查。

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