Erector : নির্মাতা;
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erect or  erector  See Words Also In
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Appropriate Prepositions
Alarm at, by, for(আশংকা করা/শঙ্কিত হওয়া): I was not alarmed at/by the news, but I was alarmed for their safety.
Astonished at(বিস্ময়-বিহবল হওয়া): We were astonished at his unexpected success.
Dwell upon (আলোচনা করা): They dwell long upon the matter.
Perfect for (সঠিক, মানানসই): The new book is perfect for you.
Repentant for (অনুতপ্ত): Kamal should be repentant for his misbehavior.
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Idioms
Back and forth (এদিক ওদিক) The mad man was running back and forth in the hospital.
Bear hard upon (behave rudely-নির্দয়ভাবে ব্যবহার করা - V) Never bear hard upon your servants.
Call to mind (স্মরণ করা): I cannot call to mind your cell number.
Fall flat (ফলপ্রসূ না হওয়া): This business is going to fall flat.
Look into something (তদন্ত করা- investigate) - The manager looked into the matter.