理论英语怎么说

理论英语说作 "theory"，来源于希腊语 "theoria"，意思是 "contemplation" 或 "speculation"。
一些英文例句：
The theory of evolution proposes that all species of organisms arise and develop through the natural selection of small, inherited variations that increase the individual's ability to compete, survive, and reproduce.
The theory of relativity is a theory of classical physics that was developed by Albert Einstein to explain the phenomenon of electromagnetic radiation.
According to the Big Bang theory, the universe was created about 13.8 billion years ago in an explosion of a very hot and dense state.
希腊语 "theoria" 来源于 "theoros"，意思是 "spectator" 或 "observer"。因此，"theory" 原本指的是对事物的观察和思考，而不是确定的结论或假设。