One mystery is how it erupted suddenly, all over, in places separated by oceans, mountain ranges, and other earthly impediments.

在由海洋、山脉和其他天然屏障阻隔地许多地方，流感为什么突然到处爆发，这是一个谜。

On December the 1st 1990, construction workers from Britain and France drilled through the last section of rock separating the two halves of the service tunnel,  linking Britain to mainland Europe for the first time since the last ice age.

1990年12月1日，英、法两国的建筑工人钻穿了最后一阻隔隧道的岩石，使英国与欧洲大陆实现了自上一个冰河时代来的首次连接。

Curtains help keep out the cold air.

窗帘可空气阻隔在外。

Greed has poisoned men's souls has barricaded the world with hate has goose-stepped us into misery and bloodshed.

贪婪毒害了人的灵魂，并用憎恨阻隔了世界，一步步让我们走向痛苦和杀戮。

This will dampen the sound waves trying to hit your eardrums.

耳塞能阻隔试图穿你耳膜的声波。

She helped the minds of her students' scale the mountain walls and reached out to the world beyond.

她开阔了学生的头脑，越大山的阻隔直达外面的世界。

What the tongue does is it comes up to touch the upper palate and instead of blocking the air and releasing, it kind of gives the upper palate a high-five.

即舌头碰到上颚，但并没有阻隔空气的流通，而是像‘击掌’一样简单地碰一下。

This all makes sense but as the doctors warned, we could easily over do it with volume, especially when the headphones are able to keep sounds out.

这一切都很合理，但就如医生所说的：我们很容易就让听的音量超，尤其是我们都认为耳机可阻隔外界的噪音。

During any given day's practice, you'll eventually gonna hit a wall where you stop making progress whether it's learning derivatives in calculus or kickflips in skateboarding.

你最终会在某一天的学习中——无论是学习微积分的导数还是滑板的踢翻——碰到一堵墙，阻隔你的进步。

The ear buds gently seal the ear for rich bass and clear highs, and the spatial vent underneath reduces that plugged-ear feeling and lets through just the right amount of environmental sound.

耳机会减缓环境的大量低音和尖锐高音，下部的特殊通风设计会降低塞耳的体验，而且还不会阻隔环境声音。

The dispute escalated this week when Luxembourg's foreign minister said Hungary should be expelled from the bloc for its hardline stance on the refugee crisis, which included erecting a border fence to keep out migrants.

在难民危机的问题上，匈牙利站定强硬立场，甚至提出设立边境铁丝网阻隔难民进入其境内。而本周卢森堡外交部长针对该强硬立场而提出将匈牙利赶出欧盟之举让这场难民危机的争论更加白热化。

So even if you're using SPF one thousand, that doesn't mean you're protected against UVA.

因此，即使你用了 SPF1000 的防晒霜，也并不意味着能阻隔 UVA 的辐射。

And the blankets also help trap some of that heat.

毯子也有助于阻隔部分热量。

And it doesn't block out all sounds.

而且它阻隔不了所有声音。

It also effectively blocks weeds and helps soil warm faster in the spring.

它还能有效地阻隔杂草及帮助土壤在春天更快地变暖。

The sun breaks through the clouds, and finally it all comes together.

阳光穿破云层的阻隔最终光芒万丈。

Which shows how important it is to block coughs and sneezes.

这就说明阻隔咳嗽和喷嚏的必要性。

Plankton need nutrients, but most nutrients are locked in the deep, denied access to the surface by a layer of water called the thermocline, around 200 metres down.

浮游生物需要养分，但几乎所有的养分都在深海，因为水下约200米深处的一层海水--温跃层的阻隔而无法到达海面。

Crucially, the team got the same result in the case of uninfested plants that had been in uninterrupted hyphal contact with the infested one, but had had root contact blocked.

关键一点，有一个实验组也得出了同样的结果——该组植株未受虫害，也没有与感染植株切断菌丝联系，仅阻隔了根接触。

It would involve the use of gigantic hoses or high-powered chemical cannons to spray chemicals into the stratosphere to act as a reflective barrier against sunlight and harmful UV rays.

该技术需要用到巨型水管或是一种高性能的化学加农炮向平流层喷洒化学物质起到反射屏障的作用阻隔阳光和有害的紫外线。