(1)(某事持續(xù)的)一段時間(unbroken period of time during which sth lasts)[C]：a hot/cold～一段炎熱/寒冷的日子;a long～of bad weather/health/sentry duty 長時間的壞天氣/身體欠佳/站崗值勤;a short～in hospital 住院的短暫時日;stay at home for a～在家待了一段時間;〖同〗while，bit，break，interval，period;
(2)輪班(值)(turn at work or duty，etc)[N(at/on)]：a～at the plane's controls/at the wheel of the car/on the typewriter 輪流駕駛/開車/打字;take～s at carrying the baby 輪流抱那嬰兒;do another～at the machine 在機(jī)器旁又輪了一次班