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microscope
mastery UK /ˈmaɪ.kɹəˌskəʊp/ US /ˈmaɪ.kɹəˌskoʊp/nounverb
card 1 of 3 · preposition
When we looked _____ a microscope, we could see tiny bacteria swimming in the water.
card 1 of 3 · preposition
When we looked _____ a microscope, we could see tiny bacteria swimming in the water.