Orography : প্রাকৃতিক ভূগোলের যে শাখায় পর্বত সম্পর্কে আলোচনা করা হয়;
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Appropriate Prepositions
Abound with(ছেয়ে থাকা): They live in a region that abounds with oil.
Based on(প্রতিষ্ঠিত, ভিত্তিক): His information is not based on the correct information.
Grasp at (আঁকড়িয়ে ধরা): He grasped me at my hand.
Hinge on/upon (নির্ভর করা): The whole matter hinges upon this clue.
Work for (কারো জন্য কাজ করা): She works for a construction company.
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Idioms
At dead of night (গভীর রাতে) The police caught the thief at dead of night.
Back and forth (to and fro-এদিক ওদিক – adv.) The mad man was walking back and forth in the doctor’s chamber.
Make head or tail – (মাথামুন্ডু বুঝা) – I cannot make head or tail of what you say.
Speed money (ঘুষ; উৎকোচ): He hankers after speed money.
Under age (অপ্রাপ্ত বয়স্ক)- He could not cast his vote because he was under age.