infinitesimally

That may not seem like much, especially given the proton's infinitesimally tiny size.

这也许并不起眼，尤其是考虑到质子极小的尺寸。

But when dealing with large masses or time periods that are infinitesimally small, like the core of a black hole or the first moments after the Big Bang, neither quite works.

但是在研究大质量物质或无限小的时间段时，比如，对黑洞的核或者是宇宙大爆炸后的最初时刻，二者都不能完美地加以解释。