Semantic nets ( sn ) has powerful capability of knowledge representation ( kr ) , but there is no accepted formal description architecture of it38 - 39 . this problem leads to different meanings of it and uncertainty of inference process 語義網(wǎng)絡(luò)有很強的表達知識的能力,但它沒有公認的形式化表示體系,存在歧義性和推理不確定性的問題。