Radial symmetry : অপকেন্দ্রিক সুসাম্য; প্রতিসাম্য;
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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.
Depend on (নির্ভর করা): Presently, the students depend on/upon guide books.
Perfect for (সঠিক, মানানসই): The new book is perfect for you.
Repent of (অনুতাপ করা): I repented of my past.
Senior to (বয়সে বড়): He is senior to me by two years.
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Idioms
At a low ebb (in an unfavorable situation প্রতিকুল অবস্থায়, ভাটির মুখে) The popularity of this singer is now at a low ebb.
Fight shy of (এড়িয়ে যাওয়া): Honest boys always fight shy of bad and dishonest friends.
Hue and cry (শোরগোল): The villagers raised a hue and cry to see the thief.
Set out (যাত্রা করা)— I will set out in time.
To the backbone (to the core, হাড়ে হাড়ে) —The boy is wicked to the backbone.