17世纪前的海上航行表明， 即使没有现代航海术的帮助， 旅行者也没有受大海的支配。
The voyages of travelers before the 17th century show that they were not at the mercy of the sea even though they did not have modern navigational aids.
17世纪前的海上航行表明，即使没有现代航海术的帮助，旅行者也没有受大海的支配。
The voyages of travelers before the 17th century show that they were not at the mercy of the sea even though they did not have modern navigational AIDS.
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