底层的英文：
rough coat
understratum

参考例句：
  • A bottom drawer;the bottom stair.
    底层抽屉;底层楼梯
  • laminar sublayer
    层[片]流底层
  • A bottom layer of nickel catalyst was provided to promote the endothermic reaction of steam and methane
    底层镍催化剂促进蒸汽和甲烷的吸热反应。
  • the submerged tenth
    (占英国人口1/10的贫困不堪的)底层阶级
  • The floor just above the ground floor of a building;a mezzanine.
    夹楼位于建筑物底层之上的楼面;夹楼
  • Because of the intense cold, the subsoil of the tundra remains permanently frozen to a great depth.
    由于严寒，冻土带的底层土仍然长久冷冻得很深。
  • A substratum of rock
    底层岩石.
  • She has rented a suite of rooms on the ground floor.
    她租了一套底层的房间。
  • The downstairs of the two little houses had been entirely refashioned.
    两栋小楼的底层已经彻底翻修过。
  • He put the old books on the bottom shelf.
    他将旧书放在底层书架上。
rough是什么意思：
adj. 粗糙的；未经加工的；粗鲁的；狂暴的；粗略的；艰苦的
n. 高低不平的地面；艰苦；未经加工的材料
v. 使粗糙；粗暴对待；草拟
adv. 粗暴地；艰苦地
  • trees with rough bark; rough ground; a rough ride; rough skin; rough blankets; his unsmooth face; unsmooth writing.
    有着粗糙树皮的树；粗糙的地面；粗野的驾驶；粗糙的皮肤；粗毛毯子；不光滑的脸；不流畅的作品。
  • Rough Bushy eyebrows
    浓密的粗眉
  • Take the rough with the smooth
coat是什么意思：
n. 上衣，外套
v. 为某物涂抹
  • disliked the make of her coat.
    不喜欢她衣服的样式
  • He wears a coat to rags.
    他把外套穿得破烂不堪。
  • Your coat has split at the seams.
    你的上装接缝处裂开了。
understratum是什么意思：
n. 底层

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