Angle of incidence : আপতন কোণ;
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Appropriate Prepositions
Beg for(অনুরোধ করা): Maria begged the Superintendent for a seat in the school hostel.
Concerned for (উদ্বিগ্ন): The parents are concerned for their growing children.
Contrary to(বিপরীত, পরিপন্থী): Students should not act contrary to the rules of discipline.
Due to (কারণে): His absence is due to illness.
Perfect for (সঠিক, মানানসই): The new book is perfect for you.
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Idioms
At a snail's pace (very slowly – খুব ধীর গতিতে) The economy of Bangladesh is growing at a snail’s pace.
Easy and free (অমায়িক): The boy is easy and free, so he has many friends.
Irony of fate (ভাগ্যের পরিহাস): He could not succeed by irony of fate.
Lose heart (হতাশ হওয়া) — Do not lose heart in danger.
Maiden speech (প্রথম বক্তৃতা): His maiden speech fell flat on the audience.