Critical angle : সংকট-কোণ;
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Appropriate Prepositions
Adequate for(পর্যাপ্ত): The loan given by the bank is not adequate for the farming project.
Caution against(সাবধান): Take all cautions against the danger.
Competent for(যোগ্য): He is not competent for the post.
Remind of (স্মরণ করিয়ে দেওয়া): He reminded me of his request to lend him some money.
Solution to (সমাধান): None can solution to every problem.
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Idioms
Dead against (তীব্র বিরোধী - strongly opposed to): I am dead against corruption.
Die in harness (কর্মরত অবস্থায় মারা যাওয়া): Dr. Sen died in harness.
Run into debt (ঋণগ্রস্ত হওয়া)— He ran into debt.
Slip of the tongue (বলায় সামান্য ভুল): This is a slip of the tongue; don’t pay much stress on it.
Without fail (অবশ্যই) - You must attend the meeting without fail.