up one's game困难

It’s not popular to say, but one reason their pay has gone up so much is that CEOs really have upped their game relative to many other workers in the U.S. economy.

这么说并不讨喜，但他们的薪酬上涨如此之多的一个原因是，相对于美国经济中的许多其他从业者，首席执行官们确实提升了自己的水平。