The two pieces being cemented together with a thin film of Canadabalsam .
再将这两块晶体用一层加拿大树胶薄膜粘合在一起。
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Canadabalsam: a viscous yellowish transparent resin obtained from the balsam fir and used as a cement for glass lenses and for mounting specimens on microscopic slides.
Canadabalsam: a viscous, yellowish, transparent resin obtained from the balsam fir and used as a cement for glass lenses and for mounting specimens on microscopic slides.