Second section is remembering past timestheory that one another mixes together against fashion.
第二部分是怀旧与时尚相融合的理论、方法部分。
2
These findings are in agreement with what you would expect from the evolutionary theory: those who like to make friends and help others can gather enough resources to make it through tough times.
这些发现与你对进化论的期望是一致的：那些喜欢交朋友和帮助别人的人能够收集足够的资源来度过艰难时期。
3
The "boomy" theory is that when times are good, we get overconfident and spend freely, then retreat into a risk-averse shell when times get tough.