n.自明之理；老生常談

It is a truism that we never really know the value of something until we lose it. 直到失去才會懂得珍惜，這是條永恒的真理。

He seems to have no unique opinion, and his speech full of truism. 他似乎沒有什么獨到的見解，他的講話充滿了陳詞濫調(diào)。

It's a truism but worth repeating: Most middle-class household budgets can be cut. 這是一個老生常談但值得重復(fù)的問題：大多數(shù)中產(chǎn)階級家庭預(yù)算都能削減。

n.利他主義；利他