asleep(形容词/副词):睡着的;入睡状态中。常用于系动词后(be/fall asleep),也可作状语表示“在睡眠中”。(另有较少见用法指“麻木的/失去知觉的”,如 my foot is asleep。)
/əˈsliːp/
I fell asleep on the sofa.
我在沙发上睡着了。
By the time the train reached the station, most passengers were already asleep, lulled by the steady rhythm of the tracks.
火车到站时,大多数乘客早已睡着,被铁轨稳定的节奏催眠了。
asleep 来自古英语结构 **a-**(表示“处于……状态”)+ sleep(睡眠),整体意思就是“处在睡眠的状态中”。英语里类似的 a- 结构还见于 awake, afloat, alive 等词。