海上交通是以航行安全和航行效率为目的的。
The purpose of maritime transportation is navigation security and navigation efficiency.
如果双桅帆船拥有比同等尺寸的单位帆船更大的帆，它在航行时会倾斜得更多，使得航行效率变低，也更容易翻船。
If a ketch had larger sails than an equivalent sloop, it would heel more (making sailing less efficient) and be more likely to capsize.
提高水和风的利用效率有助于抽水、碾磨或航行等工作。
Increased efficiency in the use of water and wind helped with such tasks as pumping, milling, or sailing.
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