must be fluent in english
... Good English speaking and computer literature 熟练掌握英文（该职位直接汇报对象为美籍员工）。 Must be fluent in English ..
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must be fluent in english
英语必须流利吗
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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So Kim Jong Un probably speaks some Japanese, through his mother (he was educated at a Swiss boarding school, so his English, French and German must be much more fluent, and he may have been tutored in Korean).
FORBES: Viewing North Korea from Japan's Perspective