一艘单桅帆船(sloop)总是有两面帆，但一艘单桅艇(cat -rigged boat)通常只有一面帆。
While a sloop always has two sails, a cat-rigged boat generally has only one.
一艘单桅帆船总是有两面帆，但一艘单桅艇通常只有一面帆。
While a sloop always has two sails, a cat-rigged boat generally has only one.
潜水艇采用单轴四尾舵。
The submarine has four stern rudder with a single large shaft.
一艘单桅帆船总是有两面帆，但一艘单桅艇通常只有一面帆。
A sloop always has two sails, while a cat-rigged boat generally has only one.
一艘单桅帆船总是有两面帆，但一艘单桅艇通常只有一面帆。
A sloop always has two sails, while a cat-rigged boat generally has only one.
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