Preservatives : সংরক্ষণকর বস্তু; সংরক্ষণকর ব্যবস্থা;
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Appropriate Prepositions
Fatigued by (ক্লান্ত): He was fatigued by hard work.
Look after (দেখাশুনা): He looks after me.
Look over (পরীক্ষা করা): He was looking over the answer scripts.
Sad at (দুঃখিত): All his colleagues were very sad at his transfer from this place.
Stick to (দৃঢ়ভাবে লেগে থাকা): We should always stick to our decisions.
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Idioms
At least (in the lowest estimate- কমপক্ষে) He is the owner of thirty lakh taka at least.
Bare word (শুধু মুখের কথা, স্বাক্ষী প্রমানহীন কথা-n) He believed your bare word and now he has been played false with.
End in smoke (ব্যর্থ হওয়া): All his plans ended in smoke.
Gala day (বিশেষ দিন): The Eid–Ul-Fitr is a gala day for Muslims.
Well up (সুপন্ডিত)- Dr. Shahidullah was well-up in Bengali language.