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fast asleep
01
深睡, 在沉睡中
very deep in sleep and difficult to be woken up
Example
Despite the noise outside, she remains fast asleep, undisturbed by the commotion.
After a long day of work, he fell into bed and was fast asleep within minutes.
By the time the plane takes off, the passengers will hopefully be fast asleep, ready for a restful journey.
