underbrush /ˈʌndəˌbrʌʃ/ TEM8

• 1. 

  N-UNCOUNT Underbrush consists of bushes and plants growing close together under the trees in a forest. (森林里树木下的)下层灌丛 [美国英语]

  例：

  ...the cool underbrush of the rain forest.

  …雨林中使人感觉凉爽的下层灌丛。