To allow all extensions for a filetype, leave both of the arrays empty for that filetype.如果想允许一种文件类型的所有扩展名,只需将针对该文件类型的所有访问控制数组设为空即可.There are telephone extensions in every office.每间办公室都有电话分机.Extensions of n - echelon cat...

There are telephone extensions in every room.每个房间都有电话分机.Some of the best extensions are made from sections of rod tube or drainpipe.最好的延长管中有些是用杆管或排水管制成的。There are telephone extensions in every office.每间办公室都有电话分机....

extensions的音标：extensions的英式发音音标为：[ɪks'tenʃnz]extensions的美式发音音标为：[ɪks'tenʃnz]...

n.延长( extension的名词复数 )，延伸，[逻辑学] 外延，扩展名...