Petro chemical : পেট্রলজাত রাসায়নিক পদার্থ;
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Appropriate Prepositions
Apology for (কোনো কারনে ক্ষমা চাওয়া): Sajib should ask apology to her of his mistake.
Die by (দূর্ঘটনা বা অপঘাতে মরা/কোন কিছু দ্বারা মারা যাওয়া): He died by a road accident.
Due to (কারণে): His absence is due to illness.
Relevant to (প্রাসঙ্গিক): Your answer is not exactly relevant to my question.
Search for (সন্ধান করা): The police searched the halls of residence for arms.
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Idioms
After all - (সব কথার পরেও): I rang and told her I couldn't come after all.
Backstairs influence (secret and illegal influence- গোপন এবং বে আইনী প্রভাব-n) He did not deseve the job, however, he got it by backstairs influence.
Kith and kin (নিকট আত্মীয়): He has no relation with his kith and kin.
Liable to mislead (প্রতারণাপূর্ণ- deceptive): Appearances can often be liable to mislead.
To play on a fiddle (অনর্থক সময় নষ্ট করা - To waste time)-He played on a fiddle by nature.