Halfdann.哈夫丹halfn.一半；下半场；半学年adj.一半的；不完全的adv.一半地；不完全地half closed and half open半睁半闭half-white black circle阴阳环half-symmetric resonator半对称谐振腔half maximum reaction rate半最高反应速率half-fixed length record半定长记录half-tone charge pattern半色调电荷图half period dry management半期旱作half amide of malonic acid丙二酸半酰胺half life of decomposition分解半衰期half-titanocene catalyst酚氧基单茂钛