1.people might think tjat the highier a person's level of unhappiness the lower his or her level of happiness and vice versa
2.unhappiness is inherited rather than influenced by envrionment
3.merchants began to look with intrerest at the began to look with interest at the open spaces outside the city limits
4.In adition to providing the pleasure of one -stop shopping ,malls were changed into beautiful parks ,with benches and outdoor entertainment
谢谢大家