Magnetic field : চৌম্বক ক্ষেত্র;
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Appropriate Prepositions
Appoint to(নিযুক্ত করা/হওয়া): Kibria has been appointed to the post of Headmaster.
Bark at(ঘেউ ঘেউ করা): The dog is barking at the strange woman.
Famous for (বিখ্যাত): Smith is famous for his wisdom.
Heir to (উত্তরাধিকার পাওয়া): He is an heir to a vast property.
Indulge in (আসক্ত): You should not indulge in social media.
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Idioms
At all (in the least degree – মোটেও না) There is no water at all in the pond.
In a fix (মুশকিলে পতিত হওয়া): The man is in a fix with his new hairstyle.
In black and white – (লিখিতভাবে) – Put forward your proposal in black and white.
Of course (অবশ্যই): Of course, you know what that meant.
Read between the lines (understand the significance, অন্তনিহিত অর্থ বুঝা) Try to read between the lines of the letter.