Some canopies have narrow strips of metal or wood to provide either sunlight or shade, depending on the position of the sun.
一些大棚使用窄长的金属或木质长条制成，根据太阳的位置，既可以提供日照，也可以提供荫凉。
Biologists have found slime molds in Antarctica, in barren deserts, high in the canopies of jungles and even on the leaves of household plants.
生物学家在南极洲、贫瘠的沙漠、丛林的树冠、甚至家居植物的叶片上发现了黏菌。
The old forest canopies often have those snags, which are big dead branches that break off and can fall erratically when the tree comes down.
老林冠往往有这种枯干，很大的死树枝，随大树倒下而崩断，不知掉到哪里去。
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