English for Science and Technology Translation Under the Guidance of Functional Equivalence Theory

English for science and technology (EST) plays an important part in making exchanges of scientific and technological information around the world. Nida's translation theory has exerted a profound influence on translation studies. Functional equivalence theory is one of the core concepts of his translation theory. This paper will analyze the guiding significance of functional equivalence theory to English for science and technology translation from the perspectives of lexical equivalence, syntactic equivalence and discourse equivalence.