The rate and pace of change in the industry is such that it's always kind of a jump ball environment where companies are not able to hang on to a great position for a super long time.

这一行变化的速度,就是这样,总处于一种跳球环境中,公司不能,永远处于不败之地。

斯坦福公开课 - 戴尔CEO-Michael.Dell谈创业和发展课程节选

So, for example, if you're the kind of person, which is I have to say all I ever was, if you're the kind of person who can kick the ball fairly hard but not very accurately, then it actually might change these numbers.

比如你是这样的一种人,我也不得不承认我以前也是这种人,如果你是那种能够大力抽射,但是精准度不高的人,那这些数据对你就不太准了

耶鲁公开课 - 博弈论课程节选

However, in one-day internationals a mandatory ball change is now enforced after 34 overs because the white titanium dioxide dye rubs off the leather.

BBC: Pink balls set for one-day trials

From the day we met, he was Mr. Sets My Brain on Fire, then he evolved for a long, lovely spell into Mr. Makes Me Sing REO Speedwagon in the Shower, but there was always an undercurrent of Mr. You Are Seriously Pushing Your Luck Here, and I eventually found myself doing the ol' step-ball-change with Mr. Why Am I Banging My Head Against This Wall?

NPR: Kristin Chenoweth Is 'A Little Bit Wicked'

But on a high friction surface like clay, the ball will grip more and change the trajectory of the ball quite significantly.

BBC: SPORT | Tennis | Rules and Equipment | On the rebound