No problem 没问题;

No pain no gain 不劳无获;

No touching! 勿碰;

No Parking! 禁止停车;

No offence! 无意冒犯;

No response：没反应;

No comment 无可奉告;

No doubt：毋庸置疑;

No cross, no crown:不经历风雨，怎么见彩虹;

No signal 没信号;

No admittance 非请勿入