Harmonic series : বিপরীত শ্রেণী; বিপরীত শ্রেণি;
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Appropriate Prepositions
Abide by(মেনে চলা): We must abide by the rules of discipline.
Answerable to (কারো কাছে জবাবদিহিতা করা): He is not answerable to anybody for his mistake.
Congratulate on(অভিনন্দন জানানো): They congratulated me on my brilliant success.
Rule over (শাসন করা): In the absence of the Parliament, the President rules over the country.
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.
Back and forth (এদিক ওদিক) The mad man was running back and forth in the hospital.
Follow the footsteps of (পায়ে পায়ে অনুসরণ করা): People always follow the footsteps of some great man.
Through and through (পুঙ্খানুপুঙ্খু রুপে)- He read the poem through and through.
Well up (সুপন্ডিত)- Dr. Shahidullah was well-up in Bengali language.