bottoming
  輸出下限; 槽底找平; 打底
  Bot·tom, v. t. [imp. & p. p. Bottomed (░); p. pr. & vb. n. Bottoming.]
  1. To found or build upon; to fix upon as a support; -- followed by on or upon.
     Action is supposed to be bottomed upon principle.   --Atterbury.
     Those false and deceiving grounds upon which many bottom their eternal state].   --South.
  2. To furnish with a bottom; as, to bottom a chair.
  3. To reach or get to the bottom of.