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学科
The simple life
18
Going green
15
Environmentalism
7
Conduct of life
5
Families
4
Gifts
3
Interpersonal relations
3
Exercise
2
Habit
2
Healthy appetite
2
Home economics
2
Outdoor life
2
Simplicity
2
Attitude (Psychology)
1
Caring
1
Christmas
1
Cleaning compounds
1
Communication in marriage
1
Diaries
1
Energy conservation
1