You don't need a light switch or a light bulb or an iPhone app to turn something on or off.
你不需要电灯开关、灯泡或苹果手机应用程序来打开或关闭某些东西。
You need a certain amount of light to get into the camera, but in manual mode you choose how to get that amount based on the other things you want for the shot.
你需要一定量的光线进入你的相机，但是在手动模式之下，你得从你想要的其他效果出发来决定这个量的多少。
LICHTMAN: And is the camera you're using, I mean, if you're working with this really low amount of light, do you need a special camera for that?
李奇曼：你用的相机是啥样的，我的意思是，如果你只用这种非常弱的光，你需要一架特殊的相机吧？
If you need a unique pattern of a pumpkin light to make you stand out among all the Jack-O '-lanterns, try to download some free but interesting patterns here.
你可以点击这里下载更多的南瓜灯图案哦。
At this time of day you need to filter out the red light to take a good photo.
在一天的这个时候，你需要过滤掉红光才能把相照好。
If you want to know exactly how big a planet is, you need to know exactly how big the star is whose light it's blocking.
如果你想知道一个行星到底有多大，那么，你就要确切地知道那颗光线被阻断了的恒星体积的大小。
You don't need it to capture a great photo. Cloudy days are better for photos than bright sunny days because the clouds diffuse the sun's light.
你不需要拍出很专业的照片。多云的天气会比万里无云的晴朗天气更适合拍照，因为云彩可以使太阳光线变得很柔和。
When you’re down in the dumps, sore, frustrated, sad, or annoyed a good laugh can be all you need to lighten your mood and to begin seeing things in a more positive light.
当你很低沉，很抑郁，很沮丧，很伤心，很烦闷的时候，你需要的便是用欢笑来放松你的情绪，然后用更积极的眼光去看待世间的一切。
Data profiling is not magic — it helps bring data quality issues to light, but you still need a data or business analyst or subject matter expert to review results and draw appropriate conclusions.
数据概要分析并不神奇——它帮助揭示数据质量问题，但是仍然需要一个数据或业务分析师或者主题专家来对结果加以评价，并得出适当的结论。
Maybe you're moving across the country (or to a different country), and you need to pack light.
或许你是要横穿整个国家(或要去往另一个国家)，那需要轻装上阵。
You need two lasers, a vacuous, light-free space and some Rubidium-85.
你需要两只激光器，一个无光的真空的空腔和一些铷- 85元素。
If you live north of a line between Atlanta and Los Angeles, the winter sun is probably too weak to give you the dose of light you require, so you'll need supplements.
如果你居住在亚特兰大-洛杉矶连线以北的地区，冬天太阳过弱不足以提供所需的阳光，所以你需要补充营养。
So, for example, we were talking about a threshold frequency as in a minimum frequency of light that you need in order to eject an electron from a metal surface.
举个例子来说，我们谈论的临界频率是，光从金属表面逐出一个电子，所需的最小频率。
Use a book light to avoid disturbing others and to avoid putting on too much light. A page or two of thoughts written down can calm you enough to restore the need for sleep.
使用台灯避免打扰其他人也可避免太强的灯光，写一两页已足够令你平静下来满足睡眠的要求。
Even the barely noticeable ambient light from streetlights, a full moon, or your neighbor's house can interfere with the circadian rhythm changes you need to fall asleep.
即便是街灯、满月，或者邻居家传来的微弱光线，也能干扰入睡所需的昼夜节律变化。
So if dusk's approaching and you can't put that book down, there's no need for alarm. But you'll be a lot more comfortable if you turn on a light.
因此，当黄昏来临时，如果你还不想把正在看的书放下，请不要惊慌，这并不会直接影响您的视力，如果想让眼睛觉得更舒服些，只要把一盏灯点亮就好。
Maybe all you need is a little light -and merely on a small patch of your skin.
也许你所需要的是一点儿光线-仅照射在你的一小块皮肤上。
But in a room with ambient light, it will provide the raw lumen power you need to put a dynamic picture up on the wall or screen.
但是，在一个房间光线的环境，将提供原始管腔权力需要放在墙壁或屏幕上的一个动态的画面了。
You do need protein to rebuild your light bodies, but you do not need the quantity that you may have typically consumed on a meat diet.
你确实需要蛋白质来重建你的光体，但是你不需要一顿肉食所摄入的量。
I need far more than only a bit of light. If you can not light me up entirely, then don't come to me.
我需要的光亮不止一点点，若你不能完全照亮我，就干脆不要来招惹我。
If it fails to inflate, or you need top up the air, blow into this tube. A light and whistle are provided to attract attention.
如果充气失败，或者你需要补充充气，向管子直接吹气即可。一个照明灯和哨子供你引起注意使用。
You need a dark sky location to see the zodiacal light, someplace where city lights aren't obscuring the natural lights in the sky.
你需要一个很黑暗天空环境去观测黄道带光，在一些有城市灯光的地方，是不容易看到天空中的自然之光的。
Many cars have a "shift Light" or indications on the speedometer that will tell you when you need to shift so you don't rev the engine too fast.
许多车在速度表上有“换挡指示灯”或标识，提示您什么时候应该换挡，别让引擎转速过高。
Paddy : Look, don't worry. Whatever happens there is always a light at the end of the tunnel – you just need to face your problem head on .
帕迪：看，不要担心。无论发生什么，黑暗中总有光明——你需要直面你的问题。
If you feel the need to have a drink, go for a bottle of light beer or a vodka and soda with a splash of lime.
如果你觉得有需要喝点什么，就喝一瓶淡啤酒或伏特加，或柠檬汁汽水。
You do not have to accept the idea that the business schools were "agents of the apocalypse" to believe that they need to change their ways, at least a little, in the light of recent events.
鉴于如今的危机，即使不去理睬那些“商学院是‘末日使者’”的说法，你也会觉得，商学院也的确需要进行变革了，哪怕一丁点也好。
You do not have to accept the idea that the business schools were "agents of the apocalypse" to believe that they need to change their ways, at least a little, in the light of recent events.
鉴于如今的危机，即使不去理睬那些“商学院是‘末日使者’”的说法，你也会觉得，商学院也的确需要进行变革了，哪怕一丁点也好。
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