【正确答案】For thousands of years, there have been various kinds of understandings about the world where we live. The world may be best presented, however, as a system including cosmology, geography, society, human beings, thinking mode and so on. Newton's Law of Universal Gravitation and Einstein's Relativity have merely laid a foundation for us to grasp the essence of the system.
Everything exists in a complex system consisting of macro-cosmos and micro-cosmos, and there are everlasting interactions among different systems at various levels. The best realization comes of a systematic approach.
The intrinsic quality of substance is ever unvarying; it has neither increased nor reduced. What has actually been altered is merely its forms: this is the so-called the " law of conservation of matter. " Matter is bound to be manifested in diversified ways.