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thrifty 强调“善于节省开支、积蓄钱财的”, 只用于人
eg. She was a thrifty woman and managed to put aside some money every month.
她是个很会持家的妇女, 每月都设法存些钱。
economical 着重“节省的”, 应用范围广, 可用来表示“在人力、物力、金钱, 甚至抽象概念方面节省的”, 可用于人或物
eg. I have to buy a more economical stove.
我得买一个更节省燃料的火炉。
I must be economical of my time. 节省时间
My new car is economical of fuel.
我的新汽车节省燃料
frugal 侧重“生活俭朴的”, 特指“饮食方面俭朴的”只用于人
eg. He was a VIP, but he had a frugal life.
他是位要人, 但生活俭朴。
With some children, small sums go a long way.
go a long way = go far（金钱）买很多东西,（人）成功，顺利
go a long way towards (doing) sth = go far towards (doing) sth
在（促成）某件事方面大有帮助
eg. A pound doesn’t go a long way.
Someone as intelligent as you should go a long way.
Their promise doesn’t go a long way towards accomplishing our present task..
Complaint won’t go a long way towards solving any problem.
