| 句子总数 | Mean | Var | SD |
S1 | 13 | 1.026923 | 0.8885897 | 0.9426504 |
S2 | 22 | 1.025 | 0.9227976 | 0.9606236 |
S3 | 26 | 0.63 | 0.745 | 0.8631338 |
S4 | 20 | 0.7625 | 1.716283 | 1.31007 |