Patent office : পেটেন্ট অফিস; কৃতিস্বত্ব কার্যালয়;
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Appropriate Prepositions
Abound in(প্রাচুর্যপূর্ণ হওয়া): Fish abounds in the pond.
Adequate for(পর্যাপ্ত): The loan given by the bank is not adequate for the farming project.
Associate with, in(জড়িত হওয়া): This man was associated with crime.
Play at (খেলা): I do not play at cards.
Thirst for (তৃষ্ণা, আকাঙ্ক্ষা): A wise man has no thirst for wealth.
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Idioms
At a standstill (নিশ্চল, অচলাবস্থায়-adj.) The discussion is now at a standstill.
Fall flat (ফলপ্রসূ না হওয়া): This business is going to fall flat.
Kith and kin (নিকট আত্মীয়): He has no relation with his kith and kin.
Laughing stock (হাসির পাত্র)— He is a laughing stock to all.
Stone’s throw (অতি নিকটে): Our school is at a stone’s throw from our house.