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- plane concave lens 平凹透镜
- Just as a double convex lens enlarges, so a double concave lens reduces. 正象双凸透镜可以放大那样，双凹透镜也可以缩小。
- Just as a double convex lens enlarges,so a double concave lens reduces. 正象双凸透镜可以放大那样，双凹透镜也可以缩小。
- A concave lens causes rays to diverge as though they are coming from a focal point. 发散透镜使光线分开,就好象从焦点上发出来的那样。
- The surfaces of the concave lens may be proportioned so as to aberrate exactly equal to the convex lens. 凹透镜的表面可以进行均匀处理，以便使像差完全与凸透镜一致。
- A pyrotechnically pumped Nd glass laser is demonstrated by the use of pyrotechnic flashlamps composed of several chemical materials arranged in a stable plane concave resonator cavity. 通过试验展示了一种烟火泵浦钕玻璃激光器，采用含多种成分的烟火闪光灯作为泵浦光源，谐振腔为稳定的半共焦平凹腔。
- plane concave head on photomultiplier 凹镜窗式光电倍增管
- Effects of concave lens on eyes of guinea pig 凹透镜对豚鼠眼生长及屈光发展的影响
- massager,massagist,concave lens,dent,dented,dirge， 按摩师;凹透镜;凹陷;凹面;哀乐，安眠药，案板
- The plane climbed until it was clear of the clouds. 飞机爬升穿出了云层。
- A METHOD IN DETERMINING THE FOCAL LENGTH OF A CONCAVE LENS 一种测量凹透镜焦距的方法
- The flier is flying a new-type jet plane on trial. 飞行员正在驾驶一架新式喷气机作试验飞行。
- a plane with a flexible face that can plane concave or convex surfaces. 有可以刨凹面或凸面的曲面的刨子。
- A Method for Measuring the Focal Length of Thin Concave Lens 一种测量薄凹透镜焦距的新方法
- A METHOD OF MEASURING PRECISELY THE RADIAL OF A CONCAVE LENS 一种较精确测量凹透镜球面半径的方法
- a plane with a flexible face that can plane concave or convex surfaces 有可以刨凹面或凸面的曲面的刨子
- Measuring the focal length of concave lens using collimator 利用准直管法测凹透镜的焦距
- The landscape unrolled under the speeding plane. 大自然的景色展现在快速飞行的飞机之下。
- Mary would rather travel by train than by plane. 玛丽宁可乘火车而不愿乘飞机旅行。
- The plane stop over in Lyons on the way to Paris. 这架去巴黎的飞机在里昂中途停留。
