一次光源 primary light source
请再次光临 Please come again ; come back soon
欢迎下次光临 hope to see you again
欢迎再次光临 Welcome back ; Welcome once again to
二次曝光 Double Xposure ; secondary exposure ; Second exposure
下次光临 Next visit
二次光学 Secondary optics
请再次光临- come back soon
次光轴 secondary optic axis
只写一次光盘 Write Once Only
很多人都是在博览会或交易会上第一次见到电话、打字机、X光，甚至冰激淋蛋卷。
Many people got their first look at the telephone, typewriter, X-ray and even the ice cream cone at an expo or fair.
因为光沿时空走直线，所以光线在时空弯曲的地方会弯曲。这现象在1919年首次被观测到。
Because light travels in a straight line through the contours of space-time, a light beam will curve where space-time curves, this curving was first measured in 1919.
这个装置的原型使用了一个10英寸的屏幕，这个屏幕是用一种新型“光致折变”（photorefractive）材料制成的，这种材料使得全息图能够每两秒刷新一次。
The prototype uses a 10 inch screen made from a new type of 'photorefractive' material that can refresh a hologram every two seconds.
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