Wave theory : তরঙ্গতত্ত্ব;
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Appropriate Prepositions
Abstain from(বিরত থাকা): I am trying to abstain from sweets for my new diet.
Creep up (বৃদ্ধি পাওয়া): The prices of are creeping up day by day.
Desire for (আকাঙ্ক্ষা করা): He has no desire for money.
Drop to (নিচে নামানো): Asif dropped his voice to a whisper.
Suffer from (অসুখে ভোগা, কষ্ট পাওয়া): He has been suffering from fever for last three days.
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Idioms
Foul play (অসদাচারণ করা): We feared that he had met with foul play.
Part and parcel (অবিচ্ছেদ্য অংশ): Education is part and parcel to build a civilized nation.
Pass sth/sb off as sth/sb (মিথ্যা পরিচয় দেয়া; Pretend – ভান করা): They were trying to pass off these shirts as genuine Armani.
Silver living (hope- আশা বা ভালো দিক): Every cloud has a silver lining.
To the brim (কানায় কানায়) - The river was full to the brim.