1.  spy on
2.  investigation

• 1. 侦查: Detect | spy on | investigate | Recon
• 2. 侦查措施: criminal investigation | investigation measure | investigative measures | criminal investigation measure
• 3. 侦查员: Investigators | scout

更多释义

• 1.侦查蜂会飞到多个地点去调查。
  Scouts fly off to investigate multiple sites.
  dict.yoduao.com
• 2.许多动物都用超声波来进行侦查，有些动物还能发出非常高频的声音。
  Ultrasound is used by many animals that detect and some of them send out very high frequency sounds.
  dict.yoduao.com
• 3.侦查过程也变得愈加困难。
  Detection is also getting harder.
  dict.yoduao.com

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