寫(xiě)作是讓看不見(jiàn)的東西變得可見(jiàn)的一種方式。
Problem solving is the central activity of intelligent systems.
The value of unpaid work is often invisible in economic measures, yet it is the backbone of society.
無(wú)償工作的價(jià)值在經(jīng)濟(jì)衡量中常常不可見(jiàn)，但它卻是社會(huì)的支柱。
A proof of a proposition is a process the nature of which is such as to produce in us a belief in that proposition.