树冠层是大多数树木的上层部分。
雨林有自己完善的系统来确保自身的生存；高大的树木有枝叶形成的树冠层来保护自身，树冠也保护着矮小的植物以及动物不受暴雨、酷暑及强风的侵扰。
Rainforests have their own perfect system for ensuring their own survival; the tall trees make a canopy of branches and leaves which protect themselves, smaller plants, and the forest animals from heavy rain, intense dry heat from the sun and strong winds.
刚果军中一名中尉似树冠层里哀嚎的猴子，毫不遮掩沮丧之意。
AS MONKEYS howl in the jungle canopy above, a weary Congolese army lieutenant makes no secret of his frustration.
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