The percentage of Gross National Product spent on education is reasonably similar in the two countries, so how is this higher and more consistent attainment in maths achieved?

两国的教育经费占国民生产总值的比例相当接近，那么，这种更高、更稳定的数学成绩是如何实现的呢？

Improved and more consistent performance.

改进性能并使性能更一致。

More consistent, symmetric operator overloading.

更一致的、对称的操作符重载。

The sound is more consistent, and controlled.

声音会更和谐，更易控制。

Existing features made more consistent, reliable.

现存的特性更健壮、可靠。