-
I could see that the word w-a-t-e-r meant something wonderful and cool that flowed over her hand.
VOA: special.2009.11.08
-
So, for example, if I have a sodium ion over here, and I have a chloride ion over here, where the distance from center to center r I'm denoting as r, this is nucleus to nucleus separation.
所以，比如这有一个钠离子，和一个氯离子，它们中心与中心间的距离,我把它设为，这是原子核和原子和的间距。
-
I can't remember their names either, but their last names begin with "R" and "S" and "A".
我也记不住他们的名字，但他们的姓氏是由“R”，“S”和“A”开头的。
-
A calf is a young cow. A young female cow, especially one that has not yet had a calf, is called a heifer: H-E-I-F-E-R.
VOA: special.2009.07.21
-
P dV is equal to R dT. pV = RT for 1 mole, pdV=RdT so I just take dV here.
对等压过程，那么。
-
When I was a young child in school, I had to learn the three R's.
VOA: special.2009.07.26
-
I've been using the blackboard a little ad hoc here, but suppose I neaten things up here now and present this rectangle is let's say R RAM, the memory inside of your computer.
我在这里特别地使用这块黑板，假如我整理这些东西，把它们呈现,这个长方形，假如说就是内存，你电脑的内存。
-
And this one, I was skiing out in Salt Lake City and the name of a building out there was Reid with R-E-I-D and it sounded good at the time."
VOA: special.2009.07.06
-
I'm glad to hear that no one counted this r equal zero as a node.
我很高兴没听到有人把ｒ等于０这处也算作是一个节点。
-
"That's kind of fun!" "What's your name?" "Broklin,B-R-O-K-L-I-N."
VOA: special.2010.04.30
-
So I got an r- I'll do it the other way around.
我有一个右,我还是反过来吧
-
The I.R.S.is the federal tax agency.
VOA: special.2009.11.02
-
All right, July, 1913, blow this up, so On the Constitution of Atoms and Molecules by N. Bohr, Doctor of Philosophy, Copenhagen, asterisk here, and I've blown up the bottom of the page, communicated by Professor Ernest Rutherford, F.R.S., Fellow of the Royal Society.
913年，六月，发表了，波尔博士,建立了原子分子模型，哥本哈根，星号这儿，我通过和恩内斯特卢瑟福的交流，被这页底部的所震惊了，英国皇家学会会员。
-
What we do is we take the interest rate, which I'll call r, and plug it into a formula, which I didn't actually do the arithmetic to their number.
我们只需将利率r,代入等式中,虽然我没有代入数字验证过...
-
I'm going to write the particular case of R and take derivatives.
我会写出 R 的一个特例,然后对其求导
-
I remember there was a toy store in my town. It was just Toys R us.
我记得我们城镇有一个玩具店，就是"Toys R us".
-
If you think of two towns down here, Brive,b-r-i-v-e,famous for its rugby, and Tulle,t-u-l-l-e,which is a capital.
如果你可以想起来这儿的两个城镇,布瑞福,b-r-i-v-e,以英式橄榄球运动而负有盛名,图勒,t-u-l-l-e,是一个省的首府
-
He urged revival of the slave-trade in the late 1850s, and he developed a theory of what he called warranteeism--w-a-r-r-a-n-t-e-e-I-s-m.
他促成了十八世纪五十年代后期,奴隶交易的复苏,还自己发明了一套理论,名为抵押品主义
-
It's true for any gas, and if I remove this limit here, r t is equal to p v bar, I'm going to call that an ideal gas.
这样的气体被称作理想气体,这就是理想气体的性质，理想气体的涵义是什么？
-
So I can instead of the dV here, I can insert this R over p dT.
两个p消掉了，结果。
-
So I have a distance here of 2 r naught.
因为有一个2r圈的距离。
-
That's what I meant. This is called R.
这就是我说的 R
-
But instead in this chemistry course, I will just tell you the solutions to differential equations. And what we can do is we can start with some initial value of r, and here I write r being ten angstroms. That's a good approximation when we're talking about atoms because that's about the size of and atom.
但在这个课里，我会直接，告诉你们微分方程的解,我们可以给距离r一个初始值,我这里把r取10埃,当我们讨论原子时,这是一个很好的近似,因为原子的尺寸。
-
We know it's going around in a circle because if I find the length of this vector, which is the x-square part, plus the y-square part, I just get r square at all times, because sine square plus cosine square is one.
我们之所以知道它做圆周运动,是因为我求出了这个矢量的模长,也就是 x 的平方加上 y 的平方,我就得到了它在任意时刻的模长平方,因为正弦平方加余弦平方始终等于1
-
And at a distance of 2 r naught, I have a positive repulsive term.
在这2r圈的距离上，这里有一个不可忽略的排斥场。
-
I'm going to just put that in, and it's the cosine of the number times i plus sine of the number times j times R.
我要在式子加入这个量,这个式子就等于这个值的余弦乘以 i,加上这个值的正弦乘以 j 再乘以常数 R
-
And when I say internuclear distance, we actually call this r here.
而当我说核间距的时候这里，我们其实还是用，r，来表示它。
-
If you want to write it as a vector equation, you want to write it as v square over r minus-- I want to say that it's pointing in the direction toward the center.
如果要写出矢量方程,就应该写成 -v^2 / r,也就是说,方向就向圆心
-
r+ And let's say that sodium has a radius, r plus, r- and chlorine has a radius, r minus, when r is very large in comparison to the radii of the ions, I don't need to draw them this way.
让我们假设钠有半径，是，氯也有半径，是，当r比离子半径大很多的时候，我不需要这样来描述。
-
If you are describing a particle with location R, the vector we use typically to locate a particle, R then R is just i times x + j times y, because you all know that's x and that's y.
如果你要描述一个位移为 R 的质点,这个矢量一般用表示质点 R 的位移,R 可表示为 i ? x + j ? y,显然你们都知道这段是 x,那段是 y
应用推荐