Air navigation : অকাশ পরিবহণ; বিমান চালন;
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Appropriate Prepositions
Add to (বৃদ্ধি করা, যোগ করা): The doll-dance in the exhibition added to our pleasure.
By heart (মুখস্থ): Kamal learnt to poem by heart.
Die of, for, from (মারা যাওয়া): He died of cholera. He died for his country. He died from an injury.
Heir to (উত্তরাধিকার পাওয়া): He is an heir to a vast property.
Meet with (হঠাৎ কোন কিছু হওয়া): Yesterday I met with an accident.
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Idioms
Back and forth (to and fro-এদিক ওদিক – adv.) The mad man was walking back and forth in the doctor’s chamber.
Crying need (জরুরী): Mass education is a crying need for India.
Far and wide (সর্বত্র): His fame spread far and wide.
Hold water (ধোপে টেকা): This policy will not hold water in this situation.
Turn over a new leaf (begin a new phase of life, নবজীবন শুরু করা) —After his failure he turned over a new leaf.