so far = until present = up to now

　　rooted in = based on

　　make their way = travel

　　vulnerable--open to break—open to attack -- weak --susceptible

　　perishable 容易腐烂的= easy to spoil

　　Seething 沸腾的 --- overflowing/excited/active

　　float = stay on the top

　　be consistent with = be compatible with

　　property 财产，特征 = characteristic = attribute (名词意为“特征，属性”)

　　simulated ---- artificial

　　sort --- type -- kind

　　staggering摇晃的; 犹豫的; 压倒的(多数) =overwhelming

　　了解更多关于托福方面的知识，请访问温州托福培训学校