N the largest and lowermost sail on the mainmast 主桅上最大最低的帆 [nautical]
By using the method of Orthogonal design this paper investigates the effects of the two-element sail on its aerodynamics performance and the matching of the main sail and the auxiliary one.
本文用正交设计方法较系统地研究了对二元素帆气动特性的影响因素和主、副帆间的配合问题。
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。
The main-sail hung drooped like a banner.
主帆耷拉着，像一面旗帜。
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