He who buys what he does not need will often need what he cannot buy.
平時(shí)隨便買(mǎi),需時(shí)無(wú)錢(qián)買(mǎi)。
更多英語(yǔ)諺語(yǔ)
A clean hand wants no washing.
The used key is always bright.
One half of the world does not know how the other half lives.