spotter

spotter
noun
  1. [often in combination]a person that looks for or observes a particular thing as a hobby or job
    喜欢(或专门)寻找(或观察)…的人
    bus-spotters.
    汽车观察爱好者。
    ■an aviator or aircraft employed in locating or observing enemy positions
    航空侦察员;侦察机
    [as modifier]spotter planes.
    侦察机。
    ■(US informal)a person employed by a company or business to keep watch on employees or customers
    (美,非正式)(由公司雇佣的)员工监督员;顾客监督员
    ■(in gymnastics, weight training, etc.) a person stationed to observe the performer and minimize the risk of accidents or injuries
    (体操、举重训练等中保障运动员安全的)现场监护人员
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