The light source must therefore be immensely brighter if it is to be used as a headlight to illuminate the path, than if it is to be used as a signal to others.
与用作被人识别的信号相比，如果用作照亮路途的头灯的话，光源必须要明亮很多。
The sky must be very dark for a moonbow to be watched clearly—any bright light can obscure it.
要想清楚地观察到月虹，天空必须非常黑暗——任何明亮的光线都可能使它模糊。
Instead, many lenses must be used in combination, where each lens does its part to have the light end up where it is supposed to.
相反，许多镜头必须结合使用，其中每个镜头分别负责在截止位置拦截部分光线。
As Plato might put it, both Neo and the cave-dwellers must undertake a difficult journey from darkness to light if genuine knowledge (and consequently true "care of the soul") is to be attained.
柏拉图也许会说，不论neo还是穴居者，都需要经过从黑暗到光明的痛苦历程，才可能取得真经，并随之大彻大悟。
Because the flash must survive multiple reflections without being absorbed or becoming too weak, not just any light can be used. It must be a laser.
因为闪光必须在反射若干次后不被吸收或者变得太弱，所以不是所有的光都可以用，必须是激光。
Suddenly, I am conscious of a white beam of light, knowing that I must follow it or be lost.
突然，我意识到一束白光，我知道我必须跟从它，否则我就会迷失。
A well of light? There must be an opening somewhere up above? It must be in the garden of the observatory!
发光的井？肯定哪儿有个朝上的开口？一定在天文台的花园里！
It will be so in the twenty-first century in which the light rail must be integrated into a planned system for new geography (quite improvised) that cannot be postponed.
它还将充满二十一世纪风格，轻轨必须融入一个规划良好的系统，开创新格局(相当即兴)，且无法被推迟。
For a color to be seen, it must be hit by light of the same color and then reflected in the direction of the fish.
对于怎样可以看出颜色，它必须被相同颜色的光击中，然后反射到鱼的方向。
For some centuries before there was experimental proof, it was believed that the speed of light must be finite.
在有实验证明以前好几个世纪，人们就已相信光的速率必定是有限的。
And what DE Broglie said is well, if it's true that light, which has a wavelength can have momentum, then it must also be true that matter, which has momentum, also has a wavelength.
德布罗意说的是，如果光具有波长和动量是对的，那么物质具有动量和波长，也一定是对的。
It must be a kind of recuperator which has small volume, light weight, high recuperated effectiveness and high reliability for using on micro gas turbine.
微型燃机的特点决定了这种回热器必须具有体积小、重量轻、回热度高、可靠性好以及易于生产制造等特点。
The normal operation of the light system directly is related to the peace of aircraft landing. In view of the importance of the airport light, it must be kept in normal working condition.
助航灯光系统的运行正常和否直接关系到飞机起降的平安，鉴于机场助航灯光对于飞机起降安全的重要性，所以必须一直保持设备始终处于正常工作状态。
Life is change, must be light and shadow, left right, fine rain, it turns in this change and do not.
生活是变化的，须有光有影，有左有右，有晴有雨，滋味就在这变而不猛的曲折里面。
It must be pointed out that space coherence of beam is highly important for light beam quality evaluation.
此外还指出光束的空间相干性在光束空间质量评价中也应重视。
If anyone deserves a happy day which brings contentment and a light heart, it must be you.
如果有人应当得到布满快乐的一天，应当有轻松舒畅的心情，这个人肯定是你。
Nanjing Huaqiang Electronic Co. Ltd is like a red rising sun, it must be a shinning star in the electronic light source industry.
南京华强电子有限公司犹如一轮红日，喷薄而出，成为电光源行业一颗璀璨明星。
Nanjing Huaqiang Electronic Co. Ltd is like a red rising sun, it must be a shinning star in the electronic light source industry.
南京华强电子有限公司犹如一轮红日，喷薄而出，成为电光源行业一颗璀璨明星。
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