検索内容:
an enemy attack
In preparation for an enemy attack, we strengthened our defense system.
happen / occur
There is a possibility that an earthquake may happen.
all of a sudden, all at once
It started raining all of a sudden.
sudden
Suddenly, it started to rain.
suddenly
He suddenly stood up.
(genetics) mutation
That disease is caused by a mutation.
sudden infant death syndrome
Sudden Infant Death Syndrome refers to the sudden death of an infant for which the cause remains unknown.
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