A balloon can fly in the air because hot air rises.
气球能在天空飞是因为热空气会向上升。
To fly, of course, is the fastest way, but you can't see anything during your stay in the air but the blue sky and white clouds.
飞行，当然，是最快的方式，但是在你停留在空中的时候，你看不到任何东西，除了蓝天和白云。
A scramjet is a type of jet engine that USES compressed air in place of conventional turbines to create thrust. Read "U." S. Developing Jets that Fly Five Times the Speed of Sound.
超音速燃烧冲压喷气发动机是利用压缩空气替代常用的涡轮，形成推力的一种喷气发动机。
We have learned to fly in the air like birds and swim in the sea like fish, but we have not learned the simple art of living together as brothers.
虽然我们已经学会了在空中像鸟儿一样飞翔，在海中像鱼儿一样游荡，但我们还是没有学会兄弟般一起生活的简朴艺术。
When he was not jumping with a parachute, he was being taught how to fly by pilots in the air show. But he could not fly as often as he liked.
当他不用降落伞往下跳时，他向飞行员学习如何在空中飞行，但他并不能总是如他所喜欢的那样飞行。
Rather than wade through this bureaucratic minefield, some simply choose to fly "off the grid" and not submit flight plans or check in with nearby air-traffic controllers before taking off.
与其经受官僚机构的严苛考验，有些人干脆选择“离网飞行”，并且在起飞前不提交飞行计划，也不在当地的空中交通管理部门登记。
It is also a place of fun. Running down a dune is easier than trekking up it, especially when you bound in great leaps and fly through the air.
这里也是一个好玩的地方，奔下沙丘要比跋涉向上容易得多，特别是你大步跨越时，飞越空中的时候。
South Korean pilots, averaging six or seven hours a week in the air, say their North Korean counterparts, flying older model MiGs, are lucky to fly once or twice a month.
南韩飞行员每周平均有六到七小时上天的机会，但他们的北方同行只能驾驶古老的米格战机，一个月或许才能有幸飞上一两次。
And they can stay in the air for more than a week, whereas most drones fly for no more than 30 hours at a time.
气球飞艇能在空中停留一个多星期，而多数无人机一次最多只能飞行30小时。
If you're planning to fly on the day before Thanksgiving, be warned. Going through security may take longer than your time in the air.
如果你想在感恩节前一天乘飞机回家，你可要做好心理准备，安检的时间可能比飞行的时间还要长。
Dogs and cats will fly in the main cabin of a Suburban Air Freight plane, retooled and lined with carriers in place of seats.
小狗和小猫们将会搭乘”萨博班航空货运公司“的飞机，机舱已将座位拆除，并一排排放好了宠物笼。
It's not as dramatic as a hover, but it will fly loops in the air, and it will await further tasking.
这不象电影上的那种盘旋，但它会在空中不断绕圈子，直到有下一步的任务。
The system’s imprecision obliges controllers to keep more distance between air traffic, reducing the number of planes that can fly in the available space.
而该系统精准度不高，管理员被迫必须拉大飞机间的距离，从而导致可利用空间内可容纳的飞机数量下降。
The system's imprecision obliges controllers to keep more distance between air traffic, reducing the number of planes that can fly in the available space.
而该系统精准度不高，管理员被迫必须拉大飞机间的距离，从而导致可利用空间内可容纳的飞机数量下降。
Running down a dune is easier than trekking up it, especially when you bound in great leaps and fly through the air. We return to the train for showers and coffee like happy Bedouins.
这里也是一个好玩的地方，奔下沙丘要比跋涉向上容易得多，特别是你大步跨越时，飞越空中的时候。
In Bosnia, the no-fly zone also proved insufficient, and it became necessary to carry out air attacks on Serbia-backed forces.
在波斯尼亚，设置禁飞区被证明并不足以解决问题，所以采取行动对塞尔维亚支持的军事力量进行空中打击也成为了必须。
These cars do not just go on land; they fly in the air, go for a dive under the ocean and even make you wonder if they indeed are cars!!
这些汽车除了能在陆上行走，还能上天入海，甚至强大到让你怀疑它们是不是汽车。
It's a common complaint: Fly on a crowded plane and come home with a cold. What's in the air up there?
经常有这样的抱怨：搭乘了一班拥挤的飞机，回到家就感冒了。机舱的空气中究竟充满了什么？
Sometimes, a car will fly by in the air.
这简直就是威胁，有时候，完全是一辆车从你眼前突然‘飞’过去。
There are 15 million of us who fly across multiple time zones every year, with 500, 000 of us in the air at any given moment.
每年都有1500万人乘坐飞机跨越不同时区，甚至每时每刻都有50万人在天上。
And to spread wing and fly in the outer air.
我欲双翅展，飞行在外面。
Apart from the 'beyond ironic' section of the Air Miles website's 'With the world in mind' green pages, there seems to be a rash of increasingly odd ways to obtain that precious right to fly for free.
除了航空里程(air Miles)网站上“世界在我心中”绿色页面中的“远超越讽刺”部分外，似乎不断有许多奇怪的方法去获得免费航行的珍贵权利。
Carried by H-5 bomber or Q-5 attacker, the Yu-2 was designed to fly using rocket engine in air at high speed before it hits the water at a very close distance to the surface target.
由轰- 5型轰炸机或强- 5型强击机携带，鱼- 2型设计采用火箭发动机在空中高速飞行，当在非常接近到水面目标的距离时进入水面。
Air routes fly over or very near some of the largest glaciers in North America.
航班飞机直接从冰川上空或北美洲一些最大冰川的附近飞过。
If I were a bird, I could fly in the air.
如果我是一只小鸟，我就会在天上飞。
If I were a bird, I could fly in the air.
如果我是一只小鸟，我就会在天上飞。
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