378. As you sleep you pass through a sequence of sleep states—light sleep, deep sleep and REM (rapid eye movement) sleep—that repeats approximately every 90 minutes.
譯文
你睡覺時會經歷一系列連續(xù)的睡眠階段——輕度睡眠、深度睡眠以及REM（眼部快速運動）睡眠——這些睡眠階段大約每90分鐘重復一次。
點睛
as此處引導的是時間狀語從句，意為“正當……時，隨著”。如：
I saw you as I was getting off the bus. 我要下公交車的時候看到了你。
pass through意為“經過”。如：
I came to say hello as I was passing through. 我路過此地，順便來跟你打個招呼。
He passed through a difficult period after the divorce. 他離婚后經歷了一段困難時期。
a sequence of意為“一系列，連續(xù)的”。如：
I was confused by a sequence of dance movements. 我被連續(xù)的舞蹈動作給弄迷糊了。
考點歸納
pass的常見短語有：
pass away意為“死”，是委婉的表達，相當于中文的“去世”。如：
Her grandfather passed away last year. 她的祖父去年去世了。
pass sth. down意為“將某物代代相傳”。如：
Such knowledge should be passed down over the centuries. 這樣的知識應該世代相傳。
pass over sth.意為“忽略某事物，回避某事”。如：
She chose to pass over his rude remarks. 她選擇對他的粗話不予理會。
