Obsidian : কাচের মতো দেখতে একজাতীয় আগ্নেয়শিলা;
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Appropriate Prepositions
Adjacent to (সন্নিহিত): His house was adjacent to the bridge.
At lunch (দুপুরের খাবারে): They were talking so much at lunch that their food went cold.
Detrimental to (অপকারী): Smoking is detrimental to health.
Independent of (স্বাধীন): They are independent of my health.
Taste of (স্বাদ; অভিজ্ঞতা): They have had some taste of problems.
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Idioms
Easy and free (অমায়িক): The boy is easy and free, so he has many friends.
Irony of fate (ভাগ্যের পরিহাস): He could not succeed by irony of fate.
Laughing stock (হাসির পাত্র)— He is a laughing stock to all.
Square meal (পেট ভরা আহার): He is too poor to have a square meal everyday.
With might and main (যথা শক্তি দিয়ে) —He tried with might and main to help me.