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In general, to furl a sail is to roll it up, such as to furl the mainsail on the boom (or into the boom or mast in some contemporary systems). 一般来说，furl 一张帆就是将其卷起，比如“卷起在悬臂(boom)或者在某些现代系统中的桅杆(mas)上的主帆”。