Sound-wave : শব্দতরঙ্গ;
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Appropriate Prepositions
At lunch (দুপুরের খাবারে): They were talking so much at lunch that their food went cold.
Bridge over (সেতু): The only entrance to Allahabad in that direction was by a bridge over the Jumna.
Lost in (মগ্ন): Simon is lost in meditation.
Noted for (বিখ্যাত): She is noted for dancing.
Play at (খেলা): I do not play at cards.
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Idioms
At times (মাঝে মাঝে): He at times comes here.
Birds of a feather (persons of like disposition-একই পর্যায়ের লোক) Bird’s of a feather flock together.
On the whole (মোটের ওপর): On the whole, his conduct is good.
Red letter day (স্মরণীয় দিন): The 16th December is a red letter day for us.
Upper hand (প্রাধান্য) - He got the upper hand in the selection.