go oversea
oversea 作副词，表示“到海外”，go 后直接接 oversea，不加介词。
She went oversea to study medicine.
她出国学医。
在海外，向国外
海外；向国外；向海外；国外
to or in a foreign country; abroad
海外；向国外；外国的；在国外的
s. being or passing over or across the sea；r. beyond or across the sea
She moved oversea to pursue her graduate studies.
她搬到海外攻读研究生。
用法提示：此处'oversea'作为副词，表示'向国外/海外'，修饰动词'moved'，说明移动的目的地。
The company ships its products oversea to over 50 countries.
这家公司将其产品运往海外超过50个国家。
用法提示：'oversea'作为副词，表示'向国外/海外'，修饰动词'ships'，说明运输的方向。
Many young people dream of traveling oversea to explore different cultures.
许多年轻人梦想去海外旅行，探索不同的文化。
用法提示：'oversea'作为副词，表示'向国外/海外'，修饰动名词'traveling'，说明旅行的目的地。
oversea 作副词，表示“到海外”，go 后直接接 oversea，不加介词。
She went oversea to study medicine.
她出国学医。
send 后可先接宾语再接 oversea，表示“把某人派往海外”。
The firm sent him oversea for training.
公司派他出国培训。
grammar · medium
易错句子My sister wants to go to oversea to study.
正确表达My sister wants to go oversea to study.
oversea 在此是副词，意为“向海外、在国外”，不能像名词一样作介词 to 的宾语；去掉 to，让副词直接修饰 go，就像 go abroad 一样。汉语“去国外”容易被逐字译成 go to + 地点，但英语副词前不加 to。
grammar · medium
易错句子He just returned from the oversea.
正确表达He just returned from oversea.
oversea 作副词表示“在海外、从海外”，不是名词，所以不能加定冠词 the；from oversea 相当于 from across the sea。汉语“从海外回来”中的“海外”看似名词，但英语这里用副词，不加 the。
oversea 与 overseas 同义，但 oversea 是较罕见的变体，现代标准英语（尤其是英式英语）通常写作 overseas；作副词或形容词时都宜用 overseas 更稳妥。
两者都可作副词表示'在国外'，但 abroad 只能作副词，不能放在名词前作定语，也不能作形容词；表示'海外市场'只能说 oversea(s) markets，不能说 abroad markets。
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