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Listen to native speakers pronounce “dark glasses” in real conversational contexts with synchronized timestamps and subtitles.
And a historian of science John-Pierre Poirier explains that a group of assistants were in charge of adjusting and moving the machine, while four scientists wearing wigsand dark glasses-- this is a complete aside that's probably really unprofessional, but I don't understand having this kind of like refractivesetup and wanting to wear a wig, but that's just me.