For example, with the wind at an intensity that a sloop might have to double-reef the main to reduce sail area, a ketch may sail very well under just jib and mizzen.

例如，当风速在某个强度上时，单桅帆可能必须将主帆四叠起来以减少帆面积，而双桅帆则可以只用前帆和后帆来顺利航行。

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Windward return: a type of course configuration requiring the boats to sail into the wind to a mark, then with the wind when returning to a second mark.

迎风返回：一种航行路线，要求船只逆风行驶，到达第一个标记后返回，顺风到达第二个标记。

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With a solar powered sail and using the sun and wind to power the batteries, the purpose of the mission is to show that renewable energy works.

VOA: standard.2009.12.10