The question is, are we happy to suppose that our grandchildren may never be able to see an elephant except in a picture book?
问题是,我们是否乐于假设我们的孙子孙女可能永远无法在大象的图片书之外看到大象?
地球是一个宇宙个体,是宇宙中独一无二的存在。
一个好的数学家是懒惰的,但要以建设性的方式。
The most dangerous phrase in business is "We've always done it this way."