名词
中文翻译：Unknown
同义词：
['critical cold', 'severe illness例句：1. She was very sick with a severe cold.（她得了重感冒，病得很重。）']
例句：
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1. She was very sick with a severe cold.
她得了重感冒，病得很重。
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2. The weather turned very cold during the critical cold spell.
在寒冷的天气中，气温急剧下降。
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3.He developed a severe illness after being exposed to the virus.
他在感染病毒后发展成了严重的疾病。