"Heavier than air flying machines are impossible".
“重于空气的飞行机是不可能的”。
When liquid oxygen evaporates the gas produced is very cold and so is much heavier than air.
当液氧蒸发时，产生的气体温度很低，并比空气轻。
Any of various winged vehicles capable of flight, generally heavier than air and driven by jet engines or propellers.
飞机各种能够飞行的带翼交通工具，通常比空气重，用喷气式发动机或螺旋桨驱动。
I say "catastrophic" because carbon dioxide is heavier than air, and a ground-hugging cloud would suffocate anyone it enveloped.
我用到“灾难性”一词，是想说二氧化碳比空气质量重，当二氧化碳形成的云层过重，空气锐减，所有下面的人都会窒息而死。
Under normal atmospheric conditions, carbon dioxide exists as a colorless, odorless gas which is about 1.5 times heavier than air.
在正常大气压下，二氧化碳是无色无味气体，密度比空气大，是空气的1.5倍。
Therefore, a precise definition of the aircraft is: there is a power-driven aircraft, fixed wing aircraft and is heavier than air.
因此飞机的精确定义就是：飞机是有动力驱动的有固定机翼的而且重于空气的航空器。
Spills would also be a health risk, since carbon dioxide is heavier than air, and so can build up in low-lying or poorly ventilated spots.
二氧化碳泄漏会带来健康风险。由于二氧化碳比空气重，因此可以在低洼地区和通风差的地区累积。
With a wing and one refers to one or more with the engine, relying on its own power to fly in the atmosphere heavier than air aircraft.
指具有机翼和一具或多具发动机，靠自身动力能在大气中飞行的重于空气的航空器。
Its vapor is heavier than air and can spread to the lower Department of considerable local, easy to generate and accumulate static electricity.
其蒸气比空气重，能在较低处扩散到相当远的地方，容易产生和积聚静电。
When carbon unites with oxygen, it forms a colorless, odorless, and tasteless gas called carbon dioxide, which is heavier than air and will extinguish a flame.
当碳与氧结合形成一种无色、无味、无嗅的气体叫做二氧化碳，它比空气重，可以灭火。
It can freeze whatever it contacts (including your eyes), it is heavier than air and can suffocate you, and it produces a poisonous gas when it comes in contact with an open flame.
它能使任何接触到的物质结冰(包括你的眼睛)，它比空气重，会使你窒息而死，当遇到明火时，它会释放出有毒气体。
When the air was warm, vapor containing the heavier isotope, oxygen-18, condensed and formed precipitation, in the form of snow, more readily than did vapor containing oxygen-16.
当空气温度较高时，含有较重同位素氧-18的蒸汽比含有氧-16的蒸汽更容易凝结，并形成雪状的降水。
But it is worth remembering that just over a century ago, heavier-than-air flight seemed an impossible dream.
但是值得回忆的是仅仅在一个世纪以前，重于空气的飞行似乎是个不可能实现的梦想。
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。
It will become way heavier than it was before and then it will even be bounced back up in the air and it goes again into free fall.
此时重量比平时大很多，然后它还会，弹起到空中，并再次做自由落体运动。
On December 17, 1903, the Wright Brothers embarked on the first sustained, heavier-than-air, man-powered flight aboard the Wright Flyer.
1903年12月17日，莱特兄弟驾驶自己制造的第一架飞机“飞行者1号”，在美国北卡罗莱纳州的基蒂霍克海滩，进行了首次有动力驱动的持续飞行。
The smoke tended to be heavier than the air, and would sink to the bottom of the space, swirling beautifully.
烟雾趋向于比空气更重，并会沉到空间的底部，优美的旋转着。
The obtained results mean that air pollution in the nearshore zone is heavier than that over the sea area, and the same is the influence of human activity.
结果意味着空气污染近岸区重于海上区，人为活动的影响也较海上区的大。
So in order to move your hand through water which is a much heavier medium than air, it will require more strength - to do that over time requires endurance of your arm muscles.
就像在第一点提到的，这要根据你的划水频率和在水里移动手臂的能力决定，牵涉到力量和耐力。 因为水的密度比空气大很多，不断地划水需要你手臂肌肉很好的耐力。
Here's another theory: cold air is heavier than hot air, so theoretically in the atmosphere, cold air should be located closer to the ground.
这是另一种理论：冷空气重于热空气，理论上说在大气层中，寒冷的空气中应位于接近地面。
Here's another theory: cold air is heavier than hot air, so theoretically in the atmosphere, cold air should be located closer to the ground.
这是另一种理论：冷空气重于热空气，理论上说在大气层中，寒冷的空气中应位于接近地面。
应用推荐