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Kev Qhia Zoo Dua Iav Beads (1.93nd)
1.93nd iav hlaws yog siv rau "Raug-Lens" hom rov qab-rov cuam tshuam cov khoom, xws li daim ntawv qhib-daim ntawv cuam tshuam kev cuam tshuam, cov ntaub npuag. duab kab xev, kab ntawv xim thiab "Encapsulated-Lens" hom rov qab-rov cuam tshuam cov ntawv, xws li cov ntawv sib zog qhia qib siab.
