A common laboratory source of light is provided by a mercury arc.
By the way, the smartphone can be a great source of light for night shooting
Please know that you have been a source of light and great guidance as I take this journey.
请注意,您已光源和伟大 指导我把这段旅程.
If you don't keep a light schedule, seeds will sprout and reach for whatever source of light they can find.
如果你不注意照明时间 种子就会发芽 种子就会朝它们能找到的 任何光源方向生长
And it's incredibly difficult to judge the distance of a point source of light in the night.
所以在夜晚判断光源的距离 是极其困难的
An artificial source of light with a strongly focused beam, as on an automobile.
探照灯:集中强光的人工光源,如在汽车上安装的探照灯
In infrared astronomy, the problem can be much worse: due to the longer wavelengths involved, the sky and the telescope themselves are a source of light.
在紅外線天文學,這個問題更為嚴重:由於包含較長的波長,天空和望遠鏡本身就是光源。
Growth or movement of a sessile organism toward or away from a source of light.
向光性,趋光性:无柄(固着)的生物朝向或远离某光源生长或运动的特性
To do this, I advise that you place your source of light half-way between lateral light and back-light, as you can see in my photo below.
要这样做,建议将光源置于边光和背光的中间,如下图所示。
A point source of microwave energy spreads out spherically and just as an optical lens collimates a source of light, electromagnetic radio waves can be collimated by a dielectric or metal-plate lens placed in front of the point source of radiating electromagnetic energy.
微波能量点源呈球面状发散,正如一个光学透镜对光源进行平行校正,位于电磁能量辐射点源前方的绝缘体透镜或金属板透镜可校正电磁无线电波。
The present invention provides a hollow prism with a characteristic refractive behavior for detection of level of a liquid, using a source of light to illuminate the hollow prism. The hollow prism of the present invention includes a hollow member with one of its ends cut normal to its axis, while the other end is cut at a substantial angle to the first. The respective ends of the cylinder, when sealed with a pair of thin-transparent or semi-transparent dielectric members to make them leak-tight for the liquid under test, trap a prismatic hollow space inside the hollow cylinder. This constitutes the hollow prism in the present invention.
本发明提供了一种采用光源为空心棱镜照明,用于检测液面,具有特殊折射特性的空心棱镜。本发明的空心棱镜包括一端与其轴线垂直,另一端与第一端具有较大角度的空心件。所述圆柱体的各个端部,在用一对薄透明或半透镜介电件密封以使其相对于进行检测的液体密封时,在所述空心圆柱体内形成棱柱形空心空间。这构成了本发明的空心棱镜。
Laughing is one of the best calorie-burning activities ever. Keep sharing giggles with everyone you come across because there is already enough darkness in the world. Be a source of light instead.
大笑是最消耗卡路里的活动. 继续和你遇到的人分享笑容吧, 因为这世界已经够黑暗的了. 争取成为一个光源.
Because the Sun is a luminous disc as seen from the Earth, rather than a point source of light, sunrise and sunset are not instantaneous and the exact definition of both can vary with context.
由於從地球看見的太陽是一個盤面,而不是點光源,所以日出和日落的瞬間狀態是很難確切定義,並且在現象上是有所不同的。