Either your watches or mine is wrong.

不是你们的表不准, 就是我的表不准。

You’re not supposed to walk on the grass.

不准践踏草坪。

No referring back to books or notes!

不准看书和笔记!

She won't permit dogs in the house.

不准许家中有狗。

According to the rules, no alcohol can be consumed on the premises.

按照规定，场内不准饮酒。

I can't rightly say what day it is.

我说不准那天是什么。

She was in doubt whether she was right.

对是否正确拿不准。

The outcome of the election was in doubt then.

当时大选的结果还看不准。

I was doubtful of my judgement.

我对己的判断拿不准。

He’s been taken to task for his habitual lack of punctuality.

他因为经常不准时而受到批评。

Khmer Rouge artillery was known to be inaccurate.

红色兵以其击不准出名。

Children unaccompanied by an adult will not be admitted.

儿童无成年人陪伴着不准入场。

No waste or garbage is to be -tied on highways.

废物和垃圾不准倒在公路上。

I cannot conjecture what his plans are.

我拿不准他的计划是什么。

This is a footpath; cars are not allowed.

这是人行道，不准汽车通行。

The referee ruled him off for rough attitude.

裁判员因他的态度粗暴而不准他参加比赛。

I wonder who those fellows were we rencountered last night.

我说不准昨晚我们碰见的那几个人是谁。

The municipal government has decided to have a clampdown on building new business centre buildings.

市政府决定不准再建造新的商业中心大楼。

The restrictions on the use of the playground are:no fighting, no damaging property.

使用这场地的条件是:不准打架, 不准损坏设施。

Rebellious students stubbornly demanded that the CIA be prevented from recruiting on campus.

反抗的学生们坚决要求不准中央情报局在学校里招募人员。