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.
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。
Even farther out to sea than the large fragments of multiyear ice are much smaller pieces of ice—so small that they are at the mercy of even small surface currents.
距离这些大块的陈年浮冰区更远的海洋里，浮冰的尺寸要小得多，小得甚至可以被海洋表层细小洋流任意摆布。
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