opaque
(of an object) blocking the passage of light and preventing objects from being seen through it

مات, غیرشفاف، کدر
[صفت]
opalescence
the visual property of something having a milky brightness and a play of colors from the surface

کدری, تابش قوسوقزحی، شیریرنگی
[اسم]
cogent
(of cases, statements, etc.) capable of making others believe that something is true with the use of logic and reasoning

متقاعدکننده, دارای قدرت
[صفت]
to clarify
to make something clear and easy to understand by explaining it more

شرح دادن, تبیین کردن، روشن کردن
[فعل]
preface
an introductory piece written by the author of a book explaining its subject, scope, or aims

مقدمه, دیباچه، پیشگفتار
[اسم]
prefatory
put or said at the beginning of a book, speech, or other work as an introduction or explanation

دیباچهای, پیشگفتاری
[صفت]

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