half [英][hɑ:f][美][hæf] adj. 一半的，半个的; n. 半; 一半; （啤酒等饮料的）半品脱; （比赛、音乐会等的）半场; adv. 一半; 部份地; Less than a half hour later he returned upstairs. 不到半个小时，他又跑上楼来。