1. The preparation of a wall, ceiling, or floor with strips of wood or metal to provide a level substratum for plaster, flooring, or another surface or to create an air space. 
   钉板条铺墙、天花板或地板前的准备工作，利用木条或金属条为室内地板材料立起水平底层或别的颊或者留出空气的空隙
2. So the guard of the Dover mail thought to himself, that Friday night in November, one thousand seven hundred and seventy-five, lumbering up Shooter's Hill, as he stood on his own particular perch behind the mail, beating his feet, and keeping an eye and a hand on the arm-chest before him, where a loaded blunderbuss lay at the top of six or eight loaded horse-pistols,deposited on a substratum of cutlass. 
   一千七百七十五年十一月底的那个星期五晚上，多佛邮车的押车卫士心里就是这么想的。那时他正随着隆隆响着的邮车往射手山上爬。他站在邮件车厢后面自己的专用踏板上，跺着脚，眼睛不时瞧着面前的武器箱，手也搁在那箱上。箱里有一把子弹上膛的大口径短抢，下面是六或八支上好子弹的马枪，底层还有一把短剑。

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• 1. 地层内段
  substrate 基底...substratum 地层内段...substructural works 底层结构工程
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• 2. 底层
  substratosphere 副平零...substratum 底层...subsurface current 次表层流
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• 3. 下层
  subsoil water地下水...substratum下层...substructure leg平台下部结构腿柱
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• 4. 下部地层
  substratosphere 副平零...substratum 下部地层...substructure 下部结构
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