Learning is any change in a system that produces a more or less permanent change in its capacity for adapting to its environment.
The past is not dead; it is not even past.
老师声称代数是完美而自然的、我们应无条件地接受它,而我甚至不能理解什么是数。对我来说数学课完全就是恐怖和折磨。我完全不理解代数,这使我胆怯得不敢问任何问题。
The energy transition must consider each country's specific conditions.