Many activities which were once pursued for their own sakes, are often given up in despair: they require techniques, the experts tell us, which take a lifetime to master.

• 专家告诉我们，出于兴趣而从事的活动经常在绝望中被人们放弃，因为工作要求一些我们用一生才能学会和掌握的技巧。