Catalyst : অনুঘটক;
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catalectic  catalyst  catalysts  See Words Also In
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Appropriate Prepositions
Adequate to(সমানুপাতিক): The salary, he gets, is not adequate to the volume of work he has to do.
Attacked by(আক্রান্ত ব্যক্তিবাচক): He has been attacked by a gang of robbers.
Burst into(কান্নায় ভেঙ্গে পড়া): He burst into tears.
Debar from (বঞ্চিত হওয়া/বাধা দেওয়া): He is debarred from getting a job.
Repent of (অনুতাপ করা): I repented of my past.
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Idioms
At a snail's pace (very slowly – খুব ধীর গতিতে) The economy of Bangladesh is growing at a snail’s pace.
Bad bargain (purchasing at a high price-বেশি দামে কেনা-n) You had a bad bargain of the watch I see.
In lieu of (পরিবর্তে): Give me this pen in lieu of that.
On the wane (হ্রাসমান): His fame is on the wane now.
Part and parcel (অবিচ্ছেদ্য অংশ): Education is part and parcel to build a civilized nation.