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。
DOUBLE surface - glider with upper and lower sail surfaces that enclose airframe to reduce drag and improve performance.
双翼面—滑翔机机架上下两面被翼布包裹，以减少阻力和提高性能。
It helped Shanghai sail through that relatively rough patch and rack up double-digit annual economic growth.
它帮助上海渡过了相对困难的时期，实现了两位数的经济增幅。
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