directnessn.直接；直率directadj.直接的；笔直的；坦白的v.对准；指挥；指示；命令direct observation form直接观察式direct ammonia recovery氨气直接回收法direct transmitted echo直达波direct aeration methods直接离心浮集法direct positive process直接阳画法direct demand operating半自动立接工作方式direct health care role直接保健作用Direct current sounding直流电测深direct transmitted beam直接透射的光束directed system of sets正向集系