The canopy.the upper level of the trees in the rain forest，holds a plethora of climbing mammals of moderately large size，which may include monkeys，cats，civets，and porcupines.
(同位语the upper level;定语从句which may include…修饰climbing mammals)
树冠层，即雨林中树林的顶部，生活着众多体型较大的爬行哺乳动物，其中可能包括猴子、猫科动物、灵猫和豪猪。
分句1：The canopy
分句2：the upper level of the trees in the rain forest，holds a plethora of climbing mammals of moderately large size
分句3：which may include monkeys，cats，civets，and porcupines
1和2并列
2和3嵌套
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