leftismn.左翼主义；急进主义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-half component[计] 左侧数, 左边部分left part nonterminal左部非终结符left thrusting method剩余推力法left auricular rhythm左房心律left-handed shooter左手握枪的射手left min-Abel rings左极小Abel环left inverse operator左逆算子left diversion tunnel左岸导流洞left/right entropy左右熵left pulse modulation脉冲宽度调制