【医】 直接视, 中央视觉

汽车，很多头盔、帽子也装备了护目镜等遮挡物来阻碍阳光从低角度直接照射过来。

直视下行大鼠气管插管的改良方法

direct marketing by mail

direct zoonosis

direct correlation

direct route

D.C.

direct-pick-up receiver (repeater receiver)

speed conversion dc telegraphy (direct-current telegraphy)

direct-current telegraphy, compensating variations