英语语法分析

It is not perceivable, because it is what makes perception possible.

它本身不能够被感知，因为它是那令感知成为可能的。

To a client of a refactored method, there is no perceivable difference.

对于重构方法的客户机来说，看不到区别。

The differences can be just a few percent-perceivable though not necessarily noticeable.

左右差异并不大，可能只有百分之几——可以分辨，但并不明显。