1.permission指“许可,允许”,并不着重说明“谁”许可或从上下文中可以看出由谁许可时,其前不用物主代词,也不用定冠词the; 如强调“谁”许可时可用物主代词,但不用定冠词the。
2.permission用在by后面时有时要用the,一般用于by the...permission of sb 结构。

Did he give you permission to take that?他允许你拿那个东西了吗?
I have obtained a written permission from the chairman.我从主席那里获得了书面许可。
With your permission I'll leave now.有你的允许,我可以离开了。
The article was reproduced by the special permission of the President.由于总统的特殊允许,这篇文章被复印了一份。

permission, permit
参见permit条。

［词源］＜中古英语permissio(运过去,让…通过)