Plano concave : সমাবতল;
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Appropriate Prepositions
Abhorrent to(ঘৃণ্য): Racism of any kind is abhorrent to me.
Breakdown of (বিস্তারিত): Here is statistical breakdown of data.
Business with (ব্যবসা, কাজ): He is pleased to do business with you.
Guard from/against (রক্ষা করা): My parents always guard me from/against bad people.
Sentence to, for (দন্ডাদেশ দেওয়া): He was sentenced to death for murder.
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Idioms
Crying need (জরুরী): Mass education is a crying need for India.
Dead of night (মধ্যরাত্রি): The robbers broke into the house at dead of night.
Maiden speech (প্রথম বক্তৃতা): His maiden speech fell flat on the audience.
Three R's (প্রাথমিক শিক্ষা)— He has not yet learnt the three R's.
Take one to task (rebuke, তিরস্কার করা)— He took me to task for negligence of duty.