fall asleep中的fall在这里是什么意思

fall asleep中的fall在这里是什么意思 fall asleep 可以fall sleep 1 fall asleep造句 fall asleep的同义词 fall asleep是什么意思 fall asleep in no fall back asleep asleep sleepy fall asleep feel asleep 区别 fall sleep和fall asleep的区别? fall asleep中fall是什么词? fast fall asleep/ fall fast asleep 哪个对? fall sound asleep,fall soundly asleep 哪个对啊 fall asleep的反义词是什么? can you fall asleep No. 英语翻译提示用上fall asleep I can't fall asleep. fall asleep at the switch sleep,sleepy,asleep,sleeping,fall asleep区别