To be classified as a rain forest, a forest must have a closed canopy, in which the treetops, or crowns, touch each other, creating a shaded forest interior. In addition, temperature and rainfall must be high and relatively even throughout the year. Forests that meet these criteria are found flanking the equator in South and Central America, Asia, Africa, and Australia.
- rain forest [rein - ˈfɔrəst] n.雨林
- canopy [ˈkænəpi] n.天篷：树林中最上面一层
- crown [kraun] n.树冠
- touch [tʌtʃ] v.接触
- criteria [kraɪˈtɪərɪə] n.标准
- flank [flæŋk] v.位于……的两侧
- equator [iˈkweitə] n.赤道
