各类瓣膜的有效开口面积差异较大，其不匹配发生率亦不相同。

Valves of various types can have very different indexed effective orifice areas, so the incidence of mismatch also varies.

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然而，由于各岛屿国家的陆地面积、1人口密度、气候、地理地形条件等有很大差异，它们的森林覆盖程度也有很大差别。

However, due to a considerable variation in land area, 1 population density and climatic, geological and topographical conditions, the extent of forest cover differs greatly among the island states.

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因此在决定选择单桅帆船还是双桅帆船时，决定因素并非帆面积，而是将这个帆面积分布在两面帆或是三面帆上带来的相应差异。

So it's not the sail area that matters when deciding between a sloop and a ketch, but differences resulting from having that area spread over three rather than two sails.

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