基本原理

fundamental principle

(bound form) base; foundation / (bound form) radical (chemistry) / (bound form) gay (loanword from English into Cantonese, Jyutping: gei1, followed by orthographic borrowing from Cantonese)

basic / fundamental / main / elementary

root / stem / origin / source / this / the current / original / inherent / originally / classifier for books, periodicals, files etc

surname Yuan / (Japanese surname) Hara

former / original / primary / raw / level / cause / source

principle / theory

texture / grain (of wood) / inner essence / intrinsic order / reason / logic / truth / science / natural science (esp. physics) / to manage / to pay attention to / to run (affairs) / to handle / to put in order / to tidy up