行家: expert; connoisseur 短语和例子行家话 expert remarks; 行家里手 experts and master hands; veteran; be expert in; be a dab at
内行: expert; adept; specialist; proficient; expert in; professionals; one who knows how; people who know the ropes; turn oneself into experts; an old hand at sth.: 充内行 pose as an expert; 向内行人学习
