| 知识点（KP） | 南京大学202x | 美国英语新闻 |
| amn. + system | 1590.84 | 1840.47 |
| von. + system | 879.68 | 618.03 |
| system | 4411.88 | 4306.83 |
| system/bit | 26.96 | 38.65 |
| system/lex | 4873.63 | 5455.35 |
| system/n | 4870.26 | 5433.37 |
| system/np | 43.82 | 42.11 |
| 名词 system | 2851.37 | 3019.59 |
| system/pos | 4870.26 | 5433.37 |
| system/ske | 20.22 | 19.32 |