n. 观察, 手表, 看守, 守护, 监视, 值班人
vt. 看, 注视, 照顾, 看守, 守护, 监视
vi. 观看, 注视, 守侯
英文释义
n. a small portable timepiece
n. a period of time (4 or 2 hours) during which some of a ship's crew are on duty
n. a purposeful surveillance to guard or observe
n. the period during which someone (especially a guard) is on duty