- tracking window
- 跟踪: follow the tracks of; tail a ...
- 观察孔: eye split; glory-hole; obser ...
- 跟踪观察: follow-up observation
- 观察孔: access hatch; access opening; disconnecting manhole; eye hole; eye sight; eye split; eyesight; inspection door; inspection hole; inspection window; observation door; observation hole; observation opening; observation port; observation window; observing aperture; peehole; peep door; peephole; porthole; sight glass; sight hole; sight tube; sight window; sightglass; sighthole; sighting hole; sighting slit; spy hole; view port=viewport; viewing port; viewing window; vision slit; window
- 观察孔,观察窗: sight glass
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