'No, I won't,' said Hermione, suddenly severe. 'You've had ten days to finish it.'
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suddenly severe
突然严重
以上为机器翻译结果，长、整句建议使用 人工翻译 。
It tends to strike suddenly, causing fevers, severe muscle aches, and a cough, often for 1-2 weeks.
FORBES: Influenza Wants You
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