anthropologist have discoverd that fear .happiness .sadness

anthropologist have discoverd that fear .happiness .sadness Anthropologists have discovered that fear,happiness,sadness Anthropologists have discovered that fear, happiness, sadnes sadness always overpower the happiness that easy Scientists have discoverd that the leaves of acertain type o You cannot apprecite happiness unless you have known sadness sadness、enerjetic和happiness是什么意思? What is happiness?That is to cover up his sadness for everyo share happiness and sadness with each happiness 和sadness有复数吗? How does happiness turns to sadness happiness,sadness,tears...sky,stars...and my