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head-wind 英 ['hedw'aɪnd] 　美 ['hedw'aɪnd]

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head-wind

phrase. 头风　

A few years ago the writer was traveling on the Grand Canal, when a head-wind prevented further progress.　几年前，笔者在大运河旅行，有一股逆风阻止了前行。

The results indicate that the head-on wind area of the tab is the main factor in determining the drag size.　结果表明，挡流板的迎风面积是决定阻力大小的主要因素。

1. A few years ago the writer was traveling on the Grand Canal, when a head-wind prevented further progress.

几年前，笔者在大运河旅行，有一股逆风阻止了前行。
2. The results indicate that the head-on wind area of the tab is the main factor in determining the drag size.

结果表明，挡流板的迎风面积是决定阻力大小的主要因素。
3. Analysis the impact factors to the total heat recovery efficiency such as head-wind speed, wheel thickness, the wheel rotational speed respectively.

当转速、迎面风速、转轮厚度单方面作用时，其全热效率都是随转轮转速的提高先升高后降低。