undergrowthKK [ˋʌndɚˏgroθ] /ˈʌndɚˌɡɹoʊθ/名詞1下層灌木叢、矮樹叢、林下植被不可數Thick undergrowth made it hard to follow the forest trail.茂密的下層灌木叢讓人很難沿著林間小徑前進。