"The best and most beautiful things in the world cannot be seen or even touched - they must be felt with the heart."
长江大海不会和废弃水井比较浊清，九霄的雷霆不会和的青蛙蚯蚓比斗谁的声响响亮。
The interplay between analysis and algebra is the driving force behind many breakthroughs in number theory.