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