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That is why we don't worry about the motion of the nucleus 1 because the ratio of mass is about 2,000 to one.
这就解释了为什么我们不担心,原子核运动起来,因为原子核和电子的质量比约为2000：
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But they have really had a big scaling down of the mass transit system this year.
但是今年确实大幅度削减了公共交通。
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So, what's the conservation of mass if we divide by the atomic masses here?
那么质量守恒是什么呢？,如果我们在这儿按原子质量划分？
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We had a great number of mass.
我们有很多受众。
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It's a particle of mass m and momentum p has this energy so you solve for the energy, you get two answers.
一个质量为m,动量为p的粒子,有这么大的能量,你解出能量,得到两个解
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She is a sort of mass of flesh.
就像Watts太太一样。
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I mean they take up a teeny bit but essentially when we're thinking about the set up of the atom, we don't have to account for them as using up a lot of the mass we're discussing.
所以我们可以假设电子没有质量,它们占据了，非常小的一部分,所以当我们考虑,原子的构造的时候,不用考虑它们的质量。
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And so we know the force for a particular mass, and we know the area of the piston.
我们知道每个质量对应的力，也知道活塞的面积。
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Some people would say, Well, there's still a part of our church, there's still a part of our Mass, there's still a part of our synagogue, we don't have to hire someone who doesn't agree with our principles.
一些人会说，我们仍保留着部分教堂生活，仍然保留着部分弥撒活动，仍保留着部分犹太教会堂，我们不必雇佣一个,不赞同我们原则的人。
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The cells of this cluster inside next to the fluid filled cavity is a region of the blastocyst called the inner cell mass.
而这簇细胞的内侧,毗邻于充满液体的空腔的一侧,这些细胞在囊胚中称为内群细胞
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We'll run about thirty seconds over as we listen to the "Lacrimosa" Out of the "Dies irae" Out of the Requiem Mass of Wolfgang Amadeus Mozart written in Vienna 1791.
我们要多听三十秒,《末日经》里的《落泪之日》,沃尔夫冈·阿玛迪乌斯·莫扎特的《安魂弥撒曲》,写于1791年维也纳
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We write it subject to conservation of mass.
要服从质量守恒定律。
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We have a table of the elements with properties varying periodically with atomic mass, so we compress all of that information and refer to it as the Periodic Table.
我们有一个元素表，其中的元素的特性,随着原子质量的改变而引起周期性的变化，所以我们将所有的信息精简,将它变成一个周期表。
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It has an atomic mass of two deuterium.
它的质量是等于重氢的质量。
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Further, the nucleus is assumed to be the seat of the essential part of the mass of the atom, and to have linear dimensions exceedingly small compared with the linear dimensions of the whole atom."
进一步的，核被认为是,原子主要质量所在的地方，和整个原子线性尺度相比,核具有很好的线性尺度“
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And he found that the middle member of the triad had an atomic mass that was midway between the atomic masses of the end members.
他发现三元组中间的元素,的原子质量,是位于两端的元素的原子质量,的中间。
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