transit pass for imports

例句：

1. 1. The transit pass is validfor a period of three months.
   过境通行证有效期为三个月。
2. 2. He needs to obtaina transit pass before entering the country.
   他需要获得过境通行证才能进入该国。
3. 3.The transit pass was issued by the customs office.
   过境通行证是由海关办公室发放的。