Boulder was one of the first cities in the nation to enforce a ban on smoking.

博尔德是该国率先施行禁烟令的城市之一。

While there no longer exists an official ban, many local warlords still enforce the conservative dress, and women show their faces at their own risk.

虽然并不存在官方的禁令，但是许多当地的军阀仍然强制要求这种保守着装。妇女露出面孔，后果自负。

But the ban proved difficult to enforce; Zimbabwe, Botswana and Namibia have in the past decades accumulated a stockpile of ivory gathered through legal efforts.

但是这项禁令实施起来非常困难。津巴布韦、博茨瓦纳和纳米比亚在过去十年里通过合法途径已经积累了大量的象牙储备。

Mr Smith said it would be impractical to police the length of girls' skirts and said a blanket ban would be easier for staff to enforce.

史密斯先生说，要管制女生裙子长度是不现实的，还是全面禁止穿裙比较方便教职工的管理。

Police from Kosovo attempted to seize two border crossings with Serbia to try to enforce a ban on Serbian imports.

科索沃警方试图控制两处与塞尔维亚的边境通道以加强对塞尔维亚的进口限制。

But she also says it'll be difficult to enforce a ban on the use of her father's image in China.

但她也说，禁止在中国使用她父亲的肖像是有难度的。

On the other hand, the belief that third-hand smoke was harmful greatly increased the likelihood the respondent also would enforce a strict smoking ban at home, Dr.Winickoff said.

另一方面，三手烟有害这一认知，使得被调查者更有可能强化家庭内的禁烟行为。

But children have to start learning to distinguish truth from spin at some point, and a total ban would be difficult to enforce.

不过孩子们需要开始学习从广告轰炸中分辨事实。

And even if one could enforce a ban on cloning, or at least insure that clones would not be a mistreated caste, the social costs of prohibition could still be high.

而即使能对克隆技术实施禁止，或至少确保克隆人不是遭受歧视的等级，禁止的社会代价仍将是巨大的。

She dreads the ban and having to enforce it.

她担心这个禁烟令，也害怕不得不执行禁烟令。

The European Union began to enforce a ban five years ago.

欧盟五年前就已经开始执行禁令。

Also, we would expect most of the embargoing countries to be reluctant to enforce the ban strictly.

同时，我们认为大多数参与禁运的国家不会严格实施禁运。

And although some airlines prohibit passengers from using such equipment during take-off and landing, most are reluctant to enforce a total ban, given that many passengers want to work during flights.

尽管有些航空公司禁止搭客在飞机起飞和下降的时辰使用这些装备，考虑到良多搭客但愿在翱翔时工作，大大都公司仍是不愿意周全禁止。

And although some airlines prohibit passengers from using such equipment during take-off and landing, most are reluctant to enforce a total ban, given that many passengers want to work during flights.

尽管有一些航空公司禁止乘客在飞机起飞或降落的时候使用这些设备，但是大多数公司还是不愿意在飞行全过程都禁止使用这些设备，因为考虑到很多旅客在飞行中还是想要工作。

Bush also contended that it would be difficult to enforce a ban on reproductive cloning while allowing research cloning, and he called the presumed benefits of research cloning "highly speculative."

布什并且坚信，很难在禁止复制性克隆的同时允许研究性的克隆，他说对研究性克隆好处的推测是“高度投机的”。

And although some airlines prohibit passengers from using such equipment during take-off and landing, most are reluctant to enforce a total ban, given that many passengers want to work during flights.

尽管有些航空公司禁止旅客在飞机起飞和降落的时候使用这些装备，考虑到许多旅客希望在飞行时工作，大多数公司还是不愿意全面禁止。

If it passes, this central Florida town would be the first in the nation to enforce a ban on goods from one particular country. What do you think about that?

如果该议案被通过，该市将是美国第一座通过议案来抵制外国产品的城市，您对此有何看法？