The man who is fit to work at any particular trade is unable to understand the science of that trade without the kindly help and cooperation of men of a totally different type of education.

The key to solving complex problems is to break them down into manageable pieces.

经过不断改善自己的动作，幼儿从独立活动中获得喜悦。

I think， I think when it’s all over， it just comes back in flashes. You know， it’s like a kaleidoscope of memories. But it just all comes back. But he never does.