He and I moved in totally different social spheres.

我和他处在完全不同的社会圈子里。

We are doing this work in the context of reforms in the economic, social and cultural spheres.

我们正在经济、社会和文化领域改革的背景下从事这项工作。

We are moving to other spheres.

我们正在转变其它领域。

But trepidation of the spheres.

但是来自空间天体的异动。

I am modeling the ions as hard spheres.

就是把离子假设为硬球体。