But gene drives also have some actual limitations.

不过基因驱动也有一些实际的限制。

Venezuela has extensive limitations on freedom of expression.

另外，委内瑞拉对由有严格的限制。

There are numerous rules governing what tourists are allowed to see and even stricter controls on what they can photograph.

在朝鲜，有不少限制游客观光的规则。而对于拍照行为，当局更是保持了更严厉的控制。

When buildings first began to grow tall in the 1890s and 1900s, height limits were imposed - such as those introduced in Chicago - to prevent their masses from blocking sunlight.

在19世纪九十年代和二十世纪初，建筑物开始建得越来越高。当时建筑物的高度有明确的限制——比如芝加哥——以防止这些建筑物阻挡阳光。

That means new rules on people's social behaviors.

这意味着会有新的规则限制人们的社交行为。

On top of all of that, there are different restrictions in different countries.

最重要的是，不同的国家有不同的限制。

There are definite restrictions on the sale of alcoholic beverages.

关于酒类的销售是有明确限制的。

Unfortunately, string theory comes with a lot of strings attached.

不幸的是，弦理论有许多特殊的限制。

As much as I'd love to be able to plow through an entire book over my morning coffee, we humans have some hard-wired limits on how far we can push our reading speeds.

虽然我很想在早啡的时候一口气读完一整本书，但我们人类对己的阅读速度有一些固有的限制。

Yeah, we can't all three dance, there are limits. -Yes, there are.

我们又不能三个人一起跳 这是有限制的 - 是的。

Second, I suggest you make a study plan because when we have limitations, a number of days or weeks we're going to study, we focus a lot more and we're much more effective.

第二，我建议你制定一个习计划，因为当我们有习限制的时候，我们会花很多时间去习，我们会更加专注，我们的效率也会更高。

Here are some suggestions from employment experts and workers for effectively setting meaningful work limits.

以下是就业专家和工人提出的一些有效设定有意义的工作限制的建议。

There's a certain number of people that can only stand at the dice table.

能站在骰子桌旁的人数是有限制的。

Oh, so it's like a limited, a really limited supply of really good deals?

哦，所以是有限制的，低价产品的数量是有限制的。

They can therefore be expected to restrain their investment, too.

因此，他们也有可能限制他们的投资。

Streaming a feature-length 4K file over the internet would run into similar bandwidth constraints.

在网缓冲4K文件也有相似的带宽限制。

Of course, there are limits to this hardware.

当然，这种硬件是有限制的。

The offer is for a limited time though, but in comparison Apple's Itunes music match service will only allow users to back up 20,000 non-itune songs for 24.99 a year.

虽然存放时间是有限制的，但相比之下，苹果的Itunes Match音乐服务每年收取24.99美金的费用，用户只能存放2万首非itune歌曲。

There are age limits and volunteers must be successful at mental and physical tests.

入伍是有年龄限制的，报名者需要通过身体和精神测试。

But of course, for all transparency, there is a limitation to this meta-analysis.

但是，当然，对于透明性来说，这个元分析是有限制的。