leftoffadj.不用的(脱掉的)leftadj.左边的adv.向左n.左边；左派分子；【体】左手拳动词leave的过去式和过去分词形式.left-hand end左端left derivative左导数,左微商left back leads左背部导联left technology左侧技术left in forward左前内曲线left half plane左半个平面leftmost string最左串left linear set左线性集left-solvableadj.左可解的left hand taper左旋锥形特性