你这是做标识的吧.否则翻起来会有不同.如No smoking (is) allowed
in the library.(is)在做标识时可以省略.其它的都类似地省略了be甚至更多.
1.Vechicles not allowed in this area
All vehicles prohibited in this area
No vehicles in this area
No vehicles allowed in this area
2.No Smoking in the library
No smoking allowed in the library
Smoking not allowed in the library
Smoking prohibited in the library