The mizzen sail functions much like a second mainsail.

航行中后桅帆基本上就像第二面主帆一样工作。

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A ketch therefore USES three primary sails: the mainsail and head sail, as on a sloop, plus the mizzen sail aft.

因此，双桅帆船使用三面主要的帆：与单桅帆船一致的主帆，前帆，以及尾桅帆。

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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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