橄榄球比赛用的不是圆球。

Rugby isn't played with a round ball.

《牛津词典》

瀬尾的研究得到了美国莫尔顿体育用品生产商赞助，在研究中，他发现在低速下球的空气动力原理设计与流畅的圆球体更相似。

Seo’s research, which was supported by sports equipment manufacturer Molten USA, found that at slower speeds the ball’s aerodynamic behaviour begins to resemble more of a smooth sphere.

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烘干压球机压出的煤球直径为40 mm - 50 mm的扁圆球形、堆集孔隙率大，透风性好。

Drying pressure ball machine pressed briquette diameter 40mm-50mm, heap oblate spherical high porosity, good ventilation.

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