气球能在天空飞是因为热空气会向上升。
它使用热空气。
部分原因似乎是热空气从楼宇密集的表面上升，造成城市大气的更大湍流。
The cause appears to be in part greater turbulence in the urban atmosphere as hot air rises from the built-up surface.
风是由热空气上升产生真空而引起的空气流动。
Wind is a current of air caused by a vacuum caused by hot air rising.
从屋顶吸出的这种热空气，在到达温室后部第二个被海水润湿的纸板壁时，便与温室空气混合。
This heated air, drawn down from the roof, then mixes with the greenhouse air as it reaches a second sea-water-moistened cardboard wall at the back of the greenhouse.
这个机器使热空气通过对流来循环。
随后，受热空气融化冰川，改变降水格局④。
Warmer air melts glaciers and changes precipitation patterns.
阁楼是冷热空气交换的源头。
来自下面热空气上升使风管朝向地面。
Warm air rising from below causes the wind tube to reach toward the ground.
热空气要较冷空气容纳更多的水蒸汽。
沿着热浪南部边缘，热空气与冷空气对撞。
Along the southern margin of the heat wave, the tropical air collided with cooler air.
烟尘进一步加热空气。
难道仅仅是热空气？
一股热空气吹进来。
保护眼睛避免受风，热空气，烟雾和灰尘的影响。
Keeping eyes protected from the wind, hot air, smoke, and dust.
热空气被牵引至地下管道，那里的水因为远离地表而总是很凉。
Hot air is drawn into the underground canal, where the water is kept cool because it is so far beneath the surface.
配套墙壁包含加热空气管道，传送到整个墙体系统。
The supporting walls contain pipes that transport heated air through the entire wall system.
这场热浪归罪于从撒哈拉沙漠向北袭来的大量热空气。
The heatwave has been blamed on masses of hot air from the Sahara Desert moving north.
热空气比冷空气密度小，因此热空气总在冷空气上方。
Warm air is less dense than cooler air so it ends up layered on top of the downward moving cooler air.
热空气可能会循环流动，从而保证新鲜农产品不会产生冷害或冻害。
Heated air may be circulated to keep fresh produce from incurring chilling or freezing injury.
冷空气从北极和西伯利亚吹来；热空气出自企业高层之口。
The cold air has been blowing out of the Arctic and Siberia; the hot air has been blowing out of the mouths of senior businessmen.
然而如果该过程中加入热空气，相变过程就会加剧，达到70%的效率。
However, if exposed to heated air, the phase change from liquid to gas is more intense, and produces an efficiency of 70 percent.
你看见的“水”，是反映在公路上面漂浮的热空气上的蓝色天空。
The "water" that you see is the blue sky reflected on hot air floating on top of the highway.
热空气从一个地方上升时，冷空气快速地流过来填充所留下的空间。
As warm air rises from a place, cool air rushes in to full the space left behind.
在烤炉中，热空气带走了蔬菜的热量，使得这一过程缓慢于开水煮菜。
In the oven, the transfer of heat from hot air to vegetable occurs more slowly than immersion in boiling water.
他在沙漠里闪闪烁烁的热空气里熔化了，在海市蜃楼的幻景里消失了。
He had melted off into the surface - shimmer of the desert, into the mirage.
当上升气流与能形成风暴的湿热空气变成高速的旋风时，就形成了龙卷风。
Tornadoes form when the updrafts of air that supply storms with warm, humid air become a vortex, or high-speed whirlwind.
这个项目的最后期限越来越近了，所以我加快速度，用热空气把模具吹干。
The deadline for the project was getting closer, so I tried to speed up the drying of the mould with hot air.
名为圣安娜的大风驱使着来自沙漠高原的干热空气向西然后向南进入南加州。
The Santa Ana winds, which whip dry air from the desert plateau westwards and downwards into southern California.
名为圣安娜的大风驱使着来自沙漠高原的干热空气向西然后向南进入南加州。
The Santa Ana winds, which whip dry air from the desert plateau westwards and downwards into southern California.
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