A tennis ball is hollow, but a base ball is solid.

网球是空心的，但棒球是实心的。

Life is more like a base-ball season, where even the best team loses one-third of its games and even the worst team has its days of brilliance.

人生更像是一个棒球赛季。即使最棒的球队也会输掉赛季三分之一的比赛，而最差的球队也有春风得意的日子。