核心问题
by sea 与 by the sea 意思是否相同?
词典解答
by sea 意为“经海路”“乘船”，而 by the sea 意为“在海边”。请对比下面例句：
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He travelled to New York by sea. (Chambers) 他乘船去了纽约。
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He went by plane, and sent his heavy boxes by sea. (LDCE) 他乘飞机走，而把大箱子由海路邮寄。
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I will take her down by the sea. 我将把她带到海边去。