预备知识 yùbèizhīshi background knowledge Definitions Defs Origin Strokes Stroke Words Sentences Sents 预备知识 預備知識 yùbèizhīshi background knowledge background knowledge or preparatory knowledge required for a task; prerequisite knowledge
预备知识 預備知識 yùbèizhīshi background knowledge background knowledge or preparatory knowledge required for a task; prerequisite knowledge
