底層的英文：
rough coat
understratum

參考例句：
  • A bottom drawer;the bottom stair.
    底層抽屜;底層樓梯
  • laminar sublayer
    層[片]流底層
  • A bottom layer of nickel catalyst was provided to promote the endothermic reaction of steam and methane
    底層鎳催化劑促進(jìn)蒸汽和甲烷的吸熱反應(yīng)。
  • the submerged tenth
    (占英國(guó)人口1/10的貧困不堪的)底層階級(jí)
  • The floor just above the ground floor of a building;a mezzanine.
    夾樓位于建筑物底層之上的樓面;夾樓
  • Because of the intense cold, the subsoil of the tundra remains permanently frozen to a great depth.
    由于嚴(yán)寒，凍土帶的底層土仍然長(zhǎng)久冷凍得很深。
  • A substratum of rock
    底層巖石.
  • She has rented a suite of rooms on the ground floor.
    她租了一套底層的房間。
  • The downstairs of the two little houses had been entirely refashioned.
    兩棟小樓的底層已經(jīng)徹底翻修過(guò)。
  • He put the old books on the bottom shelf.
    他將舊書放在底層書架上。
rough是什么意思：
adj. 粗糙的；未經(jīng)加工的；粗魯?shù)?；狂暴的；粗略的；艱苦的
n. 高低不平的地面；艱苦；未經(jīng)加工的材料
v. 使粗糙；粗暴對(duì)待；草擬
adv. 粗暴地；艱苦地
  • trees with rough bark; rough ground; a rough ride; rough skin; rough blankets; his unsmooth face; unsmooth writing.
    有著粗糙樹(shù)皮的樹(shù)；粗糙的地面；粗野的駕駛；粗糙的皮膚；粗毛毯子；不光滑的臉；不流暢的作品。
  • Rough Bushy eyebrows
    濃密的粗眉
  • Take the rough with the smooth
coat是什么意思：
n. 上衣，外套
v. 為某物涂抹
  • disliked the make of her coat.
    不喜歡她衣服的樣式
  • He wears a coat to rags.
    他把外套穿得破爛不堪。
  • Your coat has split at the seams.
    你的上裝接縫處裂開(kāi)了。
understratum是什么意思：
n. 底層

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