观察镜 sight glass ; observation mirror ; slide viewer ; inspection glass

警察太阳镜 POLICE ; rss POLICE ; P

观察目镜 workina ocular ; observation eyepiece

同温层观察镜 stratoscope

血鳞察镜 kymoscope

太阳单色光观察镜 spectrohelioscope

显微镜观察 fractography ; Microscope

多人观察直肠镜 plural observation rectoscope

双人观察显微镜 dual viewing microscope

护目镜、观察孔 Visor