Technical knowhow : প্রযুক্তি-কৌশল;
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Appropriate Prepositions
Abound in(প্রাচুর্যপূর্ণ হওয়া): Fish abounds in the pond.
Adhere to (লেগে থাকা, অটল থাকা): You should adhere to your principal.
Conform to (নিয়মনীতি অনুসরণ করা): The employees have to conform to a strict dress code.
Devoted to (মনোযোগী): He is devoted to music.
Remedy for (প্রতিকার): There is no remedy for cancer.
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Idioms
At a discount (অনাদৃত) Female education is no longer at a discount now.
As a whole (মোটের উপর, সম্পূর্ন এক মনে করে-adv.) Look at life as a whole and you will see that it is meaningful.
Bare word (শুধু মুখের কথা, স্বাক্ষী প্রমানহীন কথা-n) He believed your bare word and now he has been played false with.
Head and ears (সম্পূর্ণরূপে): He is over head and ears in debt.
In vogue (চালু): This custom is not in vogue at present.