regulator
/ˈregjʊleɪtə(r)/noun
1- a person or thing that regulates something, in particular管理者; 调节器; 尤指：
1.1
- 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。
1.2
- 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。
1.3
- a device for adjusting the balance of a clock or watch in order to regulate its speed快慢针, 校准器。