regulator

regulator
noun
  1. a person or thing that regulates something, in particular
    管理者;调节器;尤指
    ■a person or body that supervises a particular industry or business activity
    行业(或商业活动)管理者;管理机构
    ■a device for controlling the rate of working of machinery or for controlling fluid flow, in particular a handle controlling the supply of steam to the cylinders of a steam engine
    调整器,调节器;调节阀
    ■a device for adjusting the balance of a clock or watch in order to regulate its speed
    快慢针,校准器
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