direct hit直接命中directadj.直接的；笔直的；坦白的v.对准；指挥；指示；命令direct brilliant blue G直接亮蓝Gdirect radiator speaker直接辐射扬声器direct cranking starter直接摇转起动机direct letter of credit直接信用证direct learning control直接学习控制direct passive sentence直接被动语句direct energy converter能量直接转换装置direct vision kinescope直观式显象管direct viewin kinescope直视显像管direct command guidance直接指令制导,视觉跟踪指令制导