Ornithological : পক্ষিবিজ্ঞানসম্বন্ধীয়;
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Appropriate Prepositions
Convenient to(সুবিধাজনক): The work is convenient to your nature.
Derive from (উৎসারিত হওয়া): The one has been derived from the poem.
Grasp at (আঁকড়িয়ে ধরা): He grasped me at my hand.
Hunger for (আকাঙ্কা): The teacher has a great hunger for knowledge.
Indulge in (প্রশ্রয় দেওয়া): You should not indulge in idleness.
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Idioms
At all (in the least degree – মোটেও না) There is no water at all in the pond.
At least (in the lowest estimate- কমপক্ষে) He is the owner of thirty lakh taka at least.
Fall flat (ফলপ্রসূ না হওয়া): This business is going to fall flat.
Lame excuse (বাজে ওজর): The lame excuse will not do.
Lump sum (এক কালীন) — He gave us lump sum money.