Alpha particle : হিলিয়াম পরমাণুর কেন্দ্রক;
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Appropriate Prepositions
Change into (পরিবর্তিত হওয়া): At what point does boiling water change into vapor.
Consent to(মত দেওয়া): The Prime Minister consented to the proposal.
Contribution to (অবদান): His invention made a major contribution to road safety.
Due to (কারণে): His absence is due to illness.
Long for (আশা করা/কামনা করা): He longed for name and fame.
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Idioms
At death’s door (at the point of death- মৃত্যুর দ্বারে) The patient is now at death’s door.
At random (indiscriminately—এলোপাথাড়ি-adv.) He talks at random like a mad man.
Birds of a feather (persons of like disposition-একই পর্যায়ের লোক) Bird’s of a feather flock together.
Pack up a quarrel (ঝগড়া মিটানো)— He packed up their quarrel.
Up and doing (উদ্যোগী): Be up and doing and then you will succeed in your life.