1·The monkeys do not chase after lice in order to eat them, but for the sheer fun of it.
猴子捉虱子并非为了吃它们，纯为了好玩。
2·I will write later about math that is used as a tool in play, but now I am writing about math that is play — math done for no other purpose than the sheer fun and beauty of it.
以后我会谈到作为游戏工具使用的数学。但现在我要写游戏数学的事，纯粹为了乐趣和数学之美的数学。
3·The main attraction for most children is probably the sheer fun of using a controlling a weapon. No doubt, visions of the famous outlaw Robin Hood may reinforce the thrill of archery.
对大多数孩子来说，箭术的主要吸引力可能在于控制武器控制的快乐，毫无疑问，成为大名鼎鼎的罗宾汉的愿望更能激发孩子们练习箭术的热情。