Optical centre : নেত্রিক কেন্দ্র;
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Appropriate Prepositions
Aptitude for(স্বাভাবিক দক্ষতা, যোগ্যতা): He has no aptitude for public service.
Ask about (কাউকে খোঁজ করা): Rahim asked about Karim.
Born of(জন্মগ্রহণ করা): I was born of a middle class family.
By heart (মুখস্থ): Kamal learnt to poem by heart.
Cause for (চিন্তিত হওয়ার কারণ): He has never given me any cause for concern.
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Idioms
At-fault (guilty-কিংকর্তব্যবিমূঢ়, অপরাধ, দোষ adj.) You are at fault.
Black sheep - (কুলাঙ্গার): Stay away from the Black sheep.
Hold water (ধোপে টেকা): This policy will not hold water in this situation.
Hue and cry (শোরগোল): The villagers raised a hue and cry to see the thief.
Of course (অবশ্যই): Of course, you know what that meant.