To contract the circular beam symmetrically, the co-propagation of the bright and dark beams in three-dimensional self-defocusing media is studied systematically.
为了获得一种对称压缩圆光束的方法，系统研究了三维自散焦介质中亮暗光束对的共同传输。
The returning light beams merge together at the beam splitter and create an interference pattern of light and dark regions where the light waves either cancel out or reinforce each other.
返回的两束光在分束器处汇合，产生由亮区和暗区组成的干涉图案，图案中，光波要么相互抵消要么相互增强。
By reflecting a laser beam from a specially designed hologram (shown here as the colored circle), physicists created knots of dark filaments (represented by the colored knot).
通过从来自一个特殊设计的全息图(这里用彩色圆圈来表示)的激光光束的反射，物理学家创造了(用彩色结来表示)暗丝结。
Dark-clothed humans appear disgusted when they spot them from afar, and then, drawing nearer, suddenly beam smiles and benevolence.
身着深色服装的人们远远的看到它的时候表现了反胃，然后，慢慢接近，突然露出微笑和显示出爱心。
Around the dark core of an optical vortex, the energy flow carried by the light beam is like a spiral staircase, flowing in a clockwise or counterclockwise direction.
绕着光涡旋的黑暗中心，光束携带的能量流就像螺旋梯，沿着顺时针或者逆时针方向流动。
I could see the beam of his flashlight waving around in the dark.
我能够看见他的手电筒光在黑暗中四下晃动。
You can spread the beam of the flashlight very far on a dark night.
在漆黑的夜晚手电的光可以传播很远。
On dark night, some of the boys asked him to climb up on the beam of their flashlight.
在一个漆黑的夜晚，孩子们让他顺着手电筒的光柱往上爬。
I could see the beam of his torch waving around in the dark.
我能够看见他的手电筒的光在黑暗中四下晃动。
Compared with the real edge generated when parallel beam illuminates an object, the virtual edge between bright and dark areas in the phenomenon of total reflection is more complex.
和平行光照射遮光物体产生的实边缘相比，全反射现象中半明半暗视场的分界线处的虚边缘情况更为复杂。
When the room is dark, a narrow beam of light can act like a radiant2 pen or brush.
在黑暗的房间内，一束细小的光线可以成为一只发光的钢笔或画笔。
On the table stood a dark-lantern with the shutter half open, throwing a brilliant beam of light upon the iron safe, the door of which was ajar.
桌子上放着一盏熄灭了的提灯，窗板半开，亮光照在半开的保险柜上。
On the table stood a dark-lantern with the shutter half open, throwing a brilliant beam of light upon the iron safe , the door of which was ajar .
桌子上放着一盏熄灭了的提灯，窗板半开，亮光照在半开的保险柜上。
I could see the beam of his flashlight waving around in the dark.
我可以看到他的手电筒光在黑暗中上下舞动。
I could see the beam of his flashlight waving around in the dark.
我可以看到他的手电筒光在黑暗中上下舞动。
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