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while[while 词源字典]

while: [OE] While comes via prehistoric Germanic *khwīlō from the Indo-European base *qwi-. This denoted ‘rest’, and its meaning was carried through into Latin quiēs (source of English quiet) and tranquillus (source of English tranquil) and Swedish hvila and Danish hvile ‘repose, refreshment’. In English, however, and the other Germanic languages (German weile and Dutch wijl), the notion of ‘rest’ has passed, presumably via ‘period of rest’, to ‘period of time’. English while was first used as a conjunction in the 12th century.
=> quiet, tranquil[while etymology, while origin, 英语词源]