1 Subjects: “...professional characteristics...”

2 Subjects: “...characteristics of household...”

3 Subjects: “...root system characteristics...”

4 Subjects: “...ecological characteristic...”

5 Subjects: “...aggregation characteristics...”

6 Subjects: “...student characteristics...”

7 Subjects: “...attribute characteristics...”

8 Subjects: “...physicochemical characteristics...”

9 Subjects: “...spatiotemporal evolution characteristics...”

10 Subjects: “...coordination characteristics...”

11 Subjects: “...coordination characteristics...”

12 Subjects: “...spatial distribution characteristics...”

13 Subjects: “...spatial transformation characteristics...”