哲学 zhéxué HSK6 philosophy Definitions Defs Origin Strokes Stroke Words Sentences Sents 哲学家 zhéxuéjiā philosopher 哲学博士 zhéxuébóshì PhD Doctor of Philosophy; PhD哲学史 zhéxuéshǐ history of philosophy 柏拉图哲学 Bólātúzhéxué Platonism