单词：herb layer
herb layer的用法和样例：
例句
- C. gigantea is a uni-predominant species in the arbor layer, microphyll and simple leaf hemicryptophytes are dominated in the shrub and grass layers.巨柏是乔木层的单优势种，灌木层和草本层以全缘草质小型单叶地面芽植物为主。
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