A Jewish man with parents alive is a fifteen-year-old boy, and will remain a fifteen-year-old boy until they die!

Natural experiments are a powerful tool for understanding causal relationships in the real world.

我现在身体上已经无法做任何过去喜欢的事，但我并不怀念它们。

整体的属性不能从部分的属性中推导出来。

夜晚是个骗子，但黎明说出真相。