Dreaming is a distinct and necessary part of sleeping,usuall

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Dreaming is a distinct and necessary part of sleeping,usually it...
Dreaming is a distinct and necessary part of sleeping,usually (it characterized) by the occurrence of rapid eye movement (REM).分析中写到,括号内应该改为it is characterized;我看后很茫然,且不说应该改为什么,但是usually在这里能连接2个句子?

fucking damn it !both of u

Dreaming is a distinct and necessary part of sleeping,usuall loneliness is a necessary part of life. Change is a necessary part of life 的中文意思? Change is a necessary part of life ,什么意思 forming the part of sth that is most necessary and from whic the lazy girl is dreaming of marrying a rich man and t won't Tibet,was,is and always will be a part of China,is a part no 英语翻译The children are sleeping and dreaming.Suddenly the wind Is a test of spoken english necessary? is part of和 is a part of 的区别 is part of 和is a part of 的区别? it is clear that sleeping is necessary to everyone