Unfatiguable : অপরিম্লান;
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Appropriate Prepositions
Ascend from (উপরে ওঠা): Rahim watched the mist ascending from the valley.
Devote to (উৎসর্গ করা/নিয়োজিত করা): Students should devote sufficient time to their studies.
Die for (আত্নত্যাগ করা): Our Chairman died for our country.
Genius for (দক্ষতা): Nazrul had a genius for convincing girls.
Substitute for (বদলে দেওয়া): This action is substitute for that.
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Idioms
Dead against (তীব্র বিরোধী - strongly opposed to): I am dead against corruption.
Gift of the gab (বাকপটুতা): An advocate should have the gift of the gab.
Laughing stock (হাসির পাত্র)— He is a laughing stock to all.
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.