下層的英文：
substratum

參考例句：
  • Disadvantaged families
    下層貧困家庭
  • evergreen undershrub
    常綠下層灌木
  • Party activists with lower middle class pedigrees are numerous.
    黨內(nèi)積極分子中中產(chǎn)階級下層出身的很多。
  • The salt water, being more dense, flows upstream under the fresh water which is flowing downstream
    淡水在上層向下流動，比重更大的鹽水在下層逆流向上。
  • At the nadir of...
    在…的最下層[最低處]
  • He belongs to the lower middle class.
    他來自中產(chǎn)階級下層。
  • The lower deck is more convenient.
    下層甲板更方便些。
  • Tramps are in a low stratum of society.
    流浪漢生活在社會的下層。
  • Tramps are from the lowest stratum of society
    流浪漢來自社會最下層。
  • aristocrats who regarded the rabble with deep contempt.
    對下層民眾極其蔑視的貴族們
substratum是什么意思：
n. 下層;地基;根基
  • "For soft substratum, dig out the top layer (5 - 10 cm thick), sort out the animals, identify and count them."
    若是軟基質(zhì),用小鏟挖出表面5-10厘米厚的基質(zhì),找出砂泥中的動物,點(diǎn)算和鑒定。

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