To first approximation you are your own boss, and even when it comes to teaching you typically have a tremendous amount of freedom.

做个一级近似就是：你成了自己的老板——即便是在教学项目上，你仍享有巨大的自由。

youdao

What we've learned so far is as a first approximation, what we want to do is put the atom with the lowest ionization energy in the middle here.

我们之前所学的可以作为第一近似，我们要做的是把电离能，最低的原子放在中间。

youdao

So I hastily wrote up a paper giving the first order of approximation and showing that to that accuracy, at any rate, we had agreement between the theory and observation.

所以我匆忙地写了篇论文，给出一阶近似解并指出至少在这个精确度下，理论和实验结构都相符合。

youdao

What we've learned so far is as a first approximation, what we want to do is put the atom with the lowest ionization energy in the middle here.

我们之前所学的可以作为第一近似，我们要做的是把电离能,最低的原子放在中间。

麻省理工公开课 - 化学原理课程节选

It's always a good first approximation, because you need to start somewhere in terms of drawing Lewis structures, but then if you go and figure out the formal charge and you just have lots of charge separation or very high charges, like a plus 2 and a minus 2 and a minus 1 all different places in the atom, what it should tell you is maybe there's a better structure.

它总是一个好的第一近似，因为在画路易斯结构的时候,你总需要一个起点，但是如果你在算出形式电荷之后,发现有很多电荷分开了,或者说有很高的电荷，比如有一个正二，一个负二，还有一个负一1,在原子的各个地方，这应该就是在告诉你,或许还有一个更好的路易斯结构。

麻省理工公开课 - 化学原理课程节选

To a first approximation polysilicon is just boiled sand.

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