1. Even though the precise qualities of hero in literary words may vary over time, the basic exemplary function of the hero seems to remain constant.
虽然英雄的详细特点在文学著作中会经常变换，但英雄的基本职责似乎是一成未变。
2. People in prehistoric times created paints by grinding materials such as plants and clay into power and then adding water.
史前时期人们通过研磨如植物和粘土的原料后加入水来画油画。
3.Often very annoying weeds, goldenrods crowd out less hardy plants and act as hosts to many insect pests.
常常被讨厌的杂草秋麒麟草属植会物排挤很少一些耐寒植物并且在许多虫害中起到主要的作用。
