Subsequently they dried up and wind eroded the ground around the channels over millions, maybe even billions, of years, leaving the more resistant channel rocks as ridges.
随后，河槽逐渐干涸，风吹着大地，侵蚀地面，数百万年，甚至几十亿年，河槽退化为山脊形状。
This paper studies the pin-fin tube, smooth tube and finned tube on the same wind channel test apparatus through experimental method.
采用实验研究的方法，分别对针翅管，平直翅片管和光管在同一风洞实验台上进行了实验。
Adopting complex wind channel technic for improving the heat transfer.
采用复合风道技术，增强散热效果。
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