customs permit

例句：

1. 1.The customs permit is due to expire soon.
   海关许可证即将到期。
2. 2. We need a customs permit to enter the country.
   我们需要一个海关许可证才能进入该国。
3. 3. Customs officials will inspect our shipment for any customs permit violations.
   海关官员将检查我们的货物是否有违反海关许可证的行为。