the occurrence of flu发生流感 The ocean stretched as far as they could see on all sides.海洋十分辽阔，他们极目远眺无边无涯.
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the occurrence of flu
流感的发生
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Google's Flu Trends, which monitors millions of queries submitted to the giant search engine for the occurrence of flu-related keywords, is at best contemporaneous with an outbreak.
ECONOMIST: Epidemiology: Infectious personalities | The
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