The only meaningful way to study learning is through objective measurement.
研究学习的唯一有意义的方法是通过客观测量。
Death is not the opposite of life, but part of it.
Every angel is terrifying.
最好的领导者是那些最热衷于让比自己更聪明的人围绕在身边的人。
材料的质量反映了品质的质量。