Survival of the fittest : যোগ্যতমের উদ্বর্তন;
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Appropriate Prepositions
Bar to(বাধা): Poverty is not a bar to happiness.
Cure of, for(রোগমুক্ত হওয়া): This man was cured of This drug is a cure for typhoid.
Detrimental to (অপকারী): Smoking is detrimental to health.
Perfect for (সঠিক, মানানসই): The new book is perfect for you.
Pity for (করুণা, সমব্যথা): I feel pity for this helpless old man.
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Idioms
All at once - (হঠাৎ): I feel terribly sleepy all at once.
Back and forth (এদিক ওদিক) The mad man was running back and forth in the hospital.
In a nutshell (সংক্ষেপে): Tell the whole story in a nutshell.
Out of date (সেকেলে): This fashion is out of date.
Take into account (বিবেচনা করা): Your activities should be taken into account.