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双凹透镜 shuāng’āo tòujìng
anim.husb. concavoconcave lens
met. biconcave lens; concavo-concave lens
tech. bicone lens; double concave glass; double concave lens
双凹〔凸〕透镜
construct. double concave glass; double convex glass
双 凹 透镜: 1 phrase in 1 subject
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