Happiness requires both pleasure and purpose - neither alone is sufficient.

过去总是在我们的生活中存在，塑造着我们的未来。

If economists could manage to get themselves thought of as humble， competent people on a level with dentists， that would be splendid.

科学是连接过去与未来的桥梁，它让我们能够站在巨人的肩膀上看得更远。

用度少，则金价低贱；金价贱，则事情难成。