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。
Tourist have to pass through the Customs to enter other countries.
游客们必须通过海关才能进入别的国家。
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。
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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