Hydrogen is much lighter than air.
氢比空气轻得多。
Lighter than air, but harder to breathe.
轻于空气，但难以呼吸。
Lighter than air, a song or so it seems.
看似一首歌，或轻甚空气。
A balloon rises because it is lighter than air.
气球上升是因为比空气轻。
Helium is also lighter than air, but it costs a lot of money.
氦也是一种比空气轻，但它比较贵。
Hydrogen is a useful gas for balloons. It is lighter than air.
氢气对于气球来说是一种有用的气体，它比空气轻多了。
CNG made up mostly of Methane, is lighter than air, odorless and colourless.
由甲烷cng大多，比空气轻，无嗅、无色。
In addition to being lighter than air, Helium is incredibly useful, scientifically, in its liquid form!
除了轻过空气外，在科学上液氦的作用简直令人难以置信。
What thing is lighter than air that any person can hold in a second or in a minute but never in an hour?
什么东西比空气还轻，任何人只能抓住一秒或一分钟但是不能抓住一小时？
Birds are sensitive to methane gas, which when released from the air floats upward as it is lighter than air.
鸟类对甲烷很敏感，因为甲烷比空气轻，释放出来的时候会向上漂浮到空气中。
This water vapor (a gas), being lighter than air, rises until it reaches the cold upper air where it condenses into clouds.
这些水蒸气(一种气体)由于比空气轻，会上升直至达到高空冷气层，并在那里凝结成云。
Helium is far lighter than air and is inert, which means it won't combust when you combine it with air and energy, like Hydrogen does (below).
氦气比空气轻得多并且是惰性气体，这意味着，当它与空气和明火接触不会燃烧，而氢气却会(请看下图)。
Hydrogen is lighter than air, but compressing it, storing it in tanks and adding all the necessary equipment starts to tip the scales towards heavy again.
氢气比空气轻，但是将它经压缩存储在燃料箱中并添加所有必需设备后飞机又变重了。
Coral grubbs give off a gas that is lighter than air. This keeps the isles suspended in the sky, but can be a nuisance when attempting to construct buildings.
珊瑚虫会放出一种比空气还轻的气体，这种气体使诸岛悬浮于空中，但对于兴建楼房屋宇却又是阻碍不少。
Because hydrogen is lighter than air, it tends to accumulate at the top of the battery container, and if the hydrogen concentration gets too high, the mixture becomes explosive.
因为氢气比空气轻，容易在蓄电池槽顶部聚集。如果氢气浓度过高，该混合物具有爆炸性。
In the case of a civil aircraft lighter than air, the expression in flight relates to the period from the moment when it becomes detached from the surface until it becomes again attached thereto.
就轻于空气的民用航空器而言，飞行中是指自其离开地面时起至其重新着地时止。
An unmanned free balloon shall refer to a freely drifting inflatable object which is driven with no power, is piloted by nobody, is lighter than air, and whose gross mass is more than 4 kilograms.
无人驾驶自由气球，是指无动力驱动、无人操纵、轻于空气、总质量大于4千克自由漂移的充气物体。
As this air is warmed and picks up moisture, it becomes lighter than the air above it.
当这些空气被加热并吸收了水分，它会变得比上面的空气轻。
The Man Angel was lighter-than-air and had paddles like a rowboat that the aviator could pump.
“人类天使”比空气还轻，有像划艇一样的桨，飞行员可以摇动它们。
An atmosphere composed of a cold gas mix that is lighter than helium and not much heavier than hydrogen, means that hot-air ballooning will need to be used.
一个由寒冷气体混合比氦要轻但是不会比氢重很多的大气层，意味着热气球将需要使用。
Rather than use either a spherical or a cigar-shaped aerostat, as the gas-filled envelope of a lighter-than-air craft is known, Skylifter has developed a discus-shaped one.
相对于我们熟知的球形或者雪茄形的内部充满轻于空气的高空气球，Skylifter开发的是一个铁饼状的。
use lighter-than-air dirigibles as atmospheric satellites, or stratellites.
将轻气球用作atmospheric satellites,or stratellites
When the bag and the air inside are lighter than the surrounding air, the bag starts to rise.
当袋子和里边的空气变得比周围的空气轻时，袋子就开始上升。
A pilot or navigator of a lighter - than - air craft, such as a balloon.
飞船驾驶员，气球驾驶员轻于空气的航空器，例如气球的驾驶员或导航员。
Picking up a stone lying underwater, you will find that it is lighter underwater than when you lift it out into the air.
把放在水下的石头拿起来，你将会发现它在水下要比把它拿出水面时要轻。
It is common knowledge that bodies are lighter in water than they are in air.
众所周知，物体在水中比在空气中轻。
It is common knowledge that bodies are lighter in water than they are in air.
众所周知，物体在水中比在空气中轻。
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