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1·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。

2·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。

3·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。

4·Maintaining the ratio of working to retirement years is a reasonable first approximation to a guideline for determining the eligible age for retirement and health benefits.

维持工作和退休时间的比率是决定退休和医疗保障的合适年龄的第一步。

5·Homogeneous spherical elastic earth model is the first approximation of the real earth in the approach to study the earth tide, this paper gives a numerical.

球状弹性均匀地球模型是地球的一级近似，本文给出计算该地球模型固体潮应力场的计算方法。