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fast asleep
01
深い眠りに落ちている
very deep in sleep and difficult to be woken up
例
The baby is fast asleep, peacefully dreaming in the crib.
Despite the noise outside, she remains fast asleep, undisturbed by the commotion.
By the time the plane takes off, the passengers will hopefully be fast asleep, ready for a restful journey.
After a tiring day of hiking, the campers anticipate being fast asleep under the starry sky tonight.
After a long day of work, he fell into bed and was fast asleep within minutes.
