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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让某一座住宅发生流感 Chinese Flu
在温带地区的秋季和冬季期间，每年发生流感流行。
Influenza epidemics occur yearly during autumn and winter in temperate regions.
在发生流感的21公立小学，每周一天免做家庭作业，以奖励来上学的学生。
At Public School 21 in Flushing, there was a homework-free day to reward those students who showed up.
通常，受到携带了“隐蔽病毒”的肺丝虫侵袭的猪，并不因肺丝虫的侵袭立即发生流感。
As a rule the swine infested with the lungworms carrying the "masked virus" did not develop swine influenza immediately upon infestation with the lungworm.
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