wave direction ray 波向线
same direction ray 同向射线
opposite direction ray 反向射线
cathode-ray direction finder 阴极射线测向仪
Ray Direction 射线方向
cathode ray direction finder 阴极射线显示测向仪
cathode-ray direction finding 阴极射线测向 ; 阴极射线测向机
direction of arrival ray 波达方向
direction of light ray 光线方向
ray direction finder 阴极射线测向仪
·2,447,543篇论文数据，部分数据来源于NoteExpress
In every direction is a cast of thousands, occasionally punctuated by a showboating ray or reef shark.
BBC: The price of protecting paradise in Palau
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