These three lights with their respective colors just do positively mean these things.
三种颜色的灯和它们各自的颜色,自然的有各自表达的意思。
There can be some dangers, especially at nighttime. Central Park, there's no lights.
可能会有些危险,特别是在夜间。中央公园晚上没有灯,就更加危险。
I of course picked the wrong day to wear a sweatshirt under really hot lights so thankfully I came prepared with another item from the-- from the store.
当然,我在主光灯下穿了件运动衫,这确实不太明智,幸好我过来时,从商店准备了另一件。
I wish it didn't say "exit," but it does say "exit," because that kind of weakens my point, but over many auditorium doors a red light just hangs there.
如果这些灯上没有注明出口就好了“,因为这样会削弱我要证明的观点,礼堂的门上一般会挂着一盏红灯。
So, ideally what we did see was, in fact, it does have enough energy with the UV lamp, it wasn't a dramatic shift you saw because we didn't start very high and then it went to that stuck point.
所以,理想上我们所看到的,事实上,紫外灯没有足够的能力,因为我们没有从非常高开始,所以它没有一个特别显著的移动,然后它又回到了黏着点。
They are supposed to take that light out, but maybe by the end of the semester a miracle will occur. So why don't you look over here.
他们应该把灯关掉,但是可能直到期末这个奇迹,才会发生,所以,你们看这边吧。
You can replace the headlights and still be the same hunk of stuff.
你可以换车头灯,但车还是那辆车。
It is so shocking the lights go out.
灯怎么突然灭了
Imagine I have a little lamp, a little goose- one of those little gooseneck lamps, I'd put it on the table here, I'd put the height about a f-- about a foot off the table. And if I was really good, - I could hit, or time it so that when I hurt- yeah, try again. When I turn this on switch on in the lamp, at exactly the same time, I'm going to hit a key on my computer and start it running.
想象下我有一个那种小雁颈台灯-,我把它放在桌子上,大概离桌子,有一英尺那么高吧,这样挺好的,我可以打开-,或者关闭这灯,并在这同时,我可以让我电脑,开始运行。
You turn on your lamp, it happens pretty fast because current can flow very quickly through wire or through a charged - a solution of ions.
你打开灯 灯马上就亮了,电流可以迅速通过,电线或者带电荷的--电解质的溶液
Certainly if you buy them out somewhere you're going to get one that's maybe the size of a light bulb, but it's like the flood light in your backyard or something, it's a huge light.
当然,你在外购买时,倒是有可能买到灯泡大小的,不过是你家后院强光灯大小的灯泡,巨大的灯泡
U It's u, because u is to q plus w right, heat and work, but it's adiabatic. So there's no heat, exchange with the environment, and it's constant volume, so there's no p dV work, right.
什么是零?是U,因为,等于q加w,热量和功,但这是绝热的,所以系统与环境间没有热量交换;,同时它是灯体的,所以也没有pdV形式的功。
And lightning strikes again and the lights go out.
突然一道闪电打下来,灯全都灭了。
And of course it exists in a semiotic relationship to a white light over a street door which means "this is my house; if you wish you can ring the bell but I'd just as soon you stayed out."
当然它是存在于一个语义篇中的,而临街门上的白灯则意味着,这是我的房子,你要进来必须按门铃,但是你最好别进来“
It's no use talking about the negative relationship between a red light and a green light and a yellow, white, or blue one because they all have the same value.
讲什么它是红灯,不是绿灯,不是黄灯白灯一点关系都没有,它们所代表的意义都一样。
So if we think about the work function for zinc, and the work function for zinc is 6.9 times 10 to the -19 joules, do we expect that when we shine our UV light on the zinc, we'll be able to eject electrons?
如果我们考虑锌的功函数,它是6,9乘以10的-19次方焦耳,我们是否可以预测当,用紫外灯照射锌时,我们可以射出电子呢?
We'll turn the light back on for a second here.
我们马上要开灯。
Now in a stoplight, it only has three, one is tempted to say, variables plainly differing from each other: red, yellow and green we have two ways of thinking about the red light.
交通灯,三种灯,红黄绿,它们的颜色和彼此不能,我们有两种方式认识红灯的意思。
When you go down the highway and you look up and see those sodium vapor lamps, the sodium vapor exists as the dimer Na2.
你在下高速公路时,会看到一些钠蒸汽灯,蒸汽灯中钠就有以Na2存在的。
and of course we've already been gazing at that light back there, and it's not a good example.
如果我们看着那里的灯,虽然这个例子有些瑕疵。
We have a UV lamp right here, which is centered at a wavelength of 254 nanometers.
我们有一个紫外灯在这里,波长集中在254纳米处。
If only you'd known you had another 50 years, that you weren't going to die young-- or James Dean, going to burn out fast and die young-- if only you'd realized you were going to live to the ripe old age of 97, you would have picked a different life for yourself.
如果你知道自己还剩下50年,你不会英年早逝-,或者说你不会油尽灯枯,英年早逝-,如果你知道,你可以活到97岁高龄,你就会为自己选择另一种生活。
Obviously, it doesn't mean "come in" in the sense of the red light over a street door.
当然,它不像临街灯一样表示,进来吧。
This light is probably on to keep burglars away and so: "stop," right?
这个灯很可能是为了防止夜贼入侵的?
Now our first thought is, Oh, aha, that has no meaning, right?
我们的第一反应就是,这灯没什么含义?
So, if you use a black lamp or something and you excite something up to a higher energy level and then it relaxes back down to its lower energy state, it's going to emit a new wavelength of light, which is going to be visible to you.
如果你用一个紫外灯或别的,东西把某种分子激发到,更高的能级,然后它会掉回,到低能级,它就会释放,一个新的波长的光,这个光是可见的。
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