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

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。

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The river slows on the flat bottom.

河水在平坦的河床上减慢了流速。

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The model is fabricated by aluminum plates, with sharp bow, square stern, flat bottom and open deck.

试验模型为铝质、平底、尖首、方尾、开口薄壁型船模。

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Flat-bottom boats have carried eighteen million cubic yards of dredged material to the island.

VOA: special.2009.10.06

It sits flat on the ground with the bottom open to the earth.

VOA: special.2010.07.13

Cristal is one of the oddest looking bottles on the market with its clear bottle, flat bottom and cellophane wrapping.

FORBES: From Tsars to Rap Stars,The Story Behind Cristal Champagne

"A lack of coastal irregularities, " such as substantial barrier islands or hills, and the Gulf of Mexico's flat bottom make southern Louisiana "ideal for wave damage, " according to the National Weather Service Web site.

CNN: Storm surge the fatal blow for New Orleans

The flat-bottom boat balanced precariously just barely above water level, a skilled rower standing and pushing gondola-style from the back.

BBC: Safari by water in southern Africa