task·mas·ter /ˈtæskˌmæstɚ/
  工頭,監工
  Task·mas·ter n. One who imposes a task, or burdens another with labor; one whose duty is to assign tasks; an overseer.
  All is, if I have grace to use it so,
  As ever in my great Taskmaster's eye.   --Milton.
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  taskmaster
       n : someone who imposes hard or continuous work