The speech we hear is an indication of that which we don't hear. It is a necessary avoidance, a violent, sly, anguished or mocking smokescreen which keeps the other in its place.

任何优秀的飞行员，无论他有多么高的天赋和丰富的经验，都不会不使用检查表。

元素可以分为具有相似性质的组。