sù liào塑料dài tì代替le了xǔ duō许多chuán tǒng传统de的yuán liào原料。
塑料代替了许多传统的原料。
Plastics have taken the place of many conventional materials.
我们必须保持家庭传统。
We must keep up the family traditions.
当我们想到男女在社会中的传统角色时，我们认为丈夫养家，妻子照顾孩子和家庭。
When we think of the traditional roles of men and women in society, we think of husbands supporting the family, and wives taking care of the house and children.