opaque
(of an object) blocking the passage of light and preventing objects from being seen through it
不透明
[形容词]
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登录opalescence
the visual property of something having a milky brightness and a play of colors from the surface
乳光
[名词]
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登录cogent
(of cases, statements, etc.) capable of making others believe that something is true with the use of logic and clarity
令人信服的
[形容词]
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登录preface
an introductory piece written by the author of a book explaining its subject, scope, or aims
前言
[名词]
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