Optical glass : আলোকবিদ্যা-সংক্রান্ত;
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Appropriate Prepositions
By heart (মুখস্থ): Kamal learnt to poem by heart.
Famous for (বিখ্যাত): Smith is famous for his wisdom.
Good for, at (ভাল): This man is good for nothing. He is good at English.
Grateful to (কৃতজ্ঞ): We should be grateful to our teachers.
Recover from (সুস্থ হওয়া; পূর্ব অবস্থায় ফিরে আসা): The patient has not yet recovered from his severe illness.
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Idioms
At liberty (free-মুক্ত-adj.) They are at liberty to go anywhere.
Be all and end all (the ultimate out come- চরম পরিণতি—n) A loss of one million taka was the be all and end all of the projects.
Dead language (যে ভাষা এখন আর কথ্য নয়): Sanskrit is a rich language, but it is now a dead language.
Give in (বশ্যতা স্বীকার করা): We will never give in to our enemies.
In full swing (পুরোদমে): The school is in full swing after the vacation.