| 知识点（KP） | 南京大学202x | 美国英语新闻 |
| amn. + buy | 10.11 | 140.31 |
| von. + buy | 3.37 | 9.75 |
| buy | 2676.11 | 3533.44 |
| buy + von. | 2325.59 | 2104.00 |
| buy/bit | 1604.32 | 1814.31 |
| buy/lex | 3916.43 | 6714.46 |
| buy/n | 77.52 | 269.02 |
| buy/np | 13.48 | 6.74 |
| 名词 buy | 37.07 | 116.89 |
| buy/pos | 3906.32 | 6684.89 |
| buy/ske | 869.57 | 1197.54 |
| buy/v | 3828.80 | 6415.87 |
| buy/vp | 20.22 | 87.23 |
| 动词 buy | 387.60 | 624.28 |