Physics is the study of the underlying laws and mechanisms explaining how the universe works. Most of what we do in daily life is based on a principle or law of physics—dealing with forces, motion, ...
Human and physical features are things that you can see all around you. Physical features like seas, mountains and rivers are natural. They would be here even if there were no people around.
一些您可能无法访问的结果已被隐去。
显示无法访问的结果