first approximation

基本解釋

That, to a first approximation, is the neo-Darwinian account of how phenotypes evolve.
以上基本就是新達爾文主義關于表型進化的觀點。
This approach is mathematically a first approximation to messages with a variable size (bear with me, I will keep it short and simple ).
這個方法在算術上最接近大小不定的消息（請原諒，我將盡量使它簡短）。
So the first approximation is, you can realize that the molar volume of the gas is always much bigger than the volume of the solid or the liquid.
第一個近似是，你會發(fā)現氣體的摩爾體積,遠遠大于固體,和液體的摩爾體積。

While these gas molecules or atoms through first approximation, are like hard spheres.
可以看做剛性小球,每一個分子會占據。
麻省理工公開課 - 熱力學與動力學課程節(jié)選
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.
我們之前所學的可以作為第一近似，我們要做的是把電離能,最低的原子放在中間。
麻省理工公開課 - 化學原理課程節(jié)選
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.
它總是一個好的第一近似，因為在畫路易斯結構的時候,你總需要一個起點，但是如果你在算出形式電荷之后,發(fā)現有很多電荷分開了,或者說有很高的電荷，比如有一個正二，一個負二，還有一個負一1,在原子的各個地方，這應該就是在告訴你,或許還有一個更好的路易斯結構。
麻省理工公開課 - 化學原理課程節(jié)選

And there's a debt that goes up so on a first approximation, the tax cut doesn't cut away from that.
NPR: Wall Street Woes: Who Gets A Bailout?