by sea

by sea, by the sea

这两个词组仅仅相差了一个单词"the"。
by sea: 意为“走海路；坐轮船”，其中by表示乘坐交通工具或行走方式，by与名词间不可用冠词。

• they will go to america by sea.
  他们将坐轮船去美国。

by the sea: 意为“在海边”，其中by表示“在......旁边”，by与后面的名词间常有冠词修饰。

• there is a small village by the sea.
  海边有个小村庄。

1. An area of open water surrounded by sea ice.
   冰间湖由海水冰围成的一块开阔的水域
2. All the villagers took to the boats to defend their island against the attackers arriving by sea.
   全体村民上了船，抵抗海上的来犯者，保卫他们的海岛。
3. May I ask if you are fond of traveling by sea?
   我可以问一下你是否喜欢海上旅行？
4. I'm terrified of flying I'd rather go by sea.
   我害怕坐飞机--我宁愿坐船。