truism

n.

自明之理，老生常谈；

复数：truisms

1. This observation is nearly a truism.
   这个观察接近于真理。
2. It is a truism that we never really know the value of something until we lose it.
   直到失去才会懂得珍惜，这是条永恒的真理。
3. He seems to have no unique opinion, and his speech full of truism.
   他似乎没有什么独到的见解，他的讲话充满了陈词滥调。
4. It's a truism but worth repeating: Most middle-class household budgets can be cut.
   这是一个老生常谈但值得重复的问题：大多数中产阶级家庭预算都能削减。

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Introduction À Une Science du Langage
The quest for a unified model of anesthetic action: a century in Claude Bernard's shadow.