permission

He asked permission to leave the room..他请求离开房间的许可。

They cannot leave the country without permission..没有许可他们不得离开这个国家。

without permission,未经许可

with one's permission,如果…允许的话

written permission,书面许可证；签单

ask for permission,征求许可；请求允许

planning permission,（英）建筑许可证（建造或改建房屋前必须获得的）

give permission,准许

grant permission,准许