Word

HSK	Not in HSK
FREQUENCY	Unknown

概念验证 gài niàn yàn zhèng

DEFINITIONS

proof of concept

CHARACTERS

概 gài HSK 4	generally, approximately
念 niàn HSK 5	think of, recall, study
验 yàn HSK 4	test, examine, inspect; verify
证 zhèng HSK 4	prove, confirm, verify; proof