其次是屋顶下方的一个小坡度。

The second is a light gradient under the roofing.

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这个农场有个小坡度让雨水和雪水淌到河里去。

This farm has a slight slope that causes the water from rain and snow to flow down to the river.

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因此工程师们添加了例如小坡度后盖、平整的底板以及能控制气流的小型的褶皱和鳍翼之类的细节设计。

So engineers added details such as a gently sloping rear hatch, a flat bottom and small creases and fins that manage airflow.

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