Halform三卤甲烷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 a billion dollars五亿元half-formed thoughts尚未成熟的思想half-round bar steel半圆钢half turning handstand倒立转体180°half-shadow analyzer半影分析器half-sovereign state半主权国half frosted lamp bulb半磨砂灯泡half-normal solution[医] 二分之一当量溶液(0.；5N溶液)half circle protractor半圆分度器half- pipe snowboard单板U型场地滑雪