head bay

• 1. 上闸首: head bay | upper gate bay | upper lock head
• 2. 上闸首人字闸门: upper miter gates

• 1.其第一级上闸首人字门的淹没水深达35米。
  The immersed water depth of the upper miter gate at first step is up to 35 meters.
  dict.yoduao.com
• 2.三峡工程—临时船闸上闸首、下闸首船闸液压系统总成。
  Three Gorges Project-Upper and lower lock heads for the temporary ship lock Ship lock hydraulic system assembly.
  dict.yoduao.com

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