Echelons : পর্যায়; স্তর;
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Appropriate Prepositions
Abound with(ছেয়ে থাকা): They live in a region that abounds with oil.
Argue with, about(কথা কাটাকাটি করা): They always argue with me about tiny matter.
Deaf to, of, in (না শোনা, বধির হওয়া): The boy is deaf to his father’s advice. This man is deaf of/in one ear.
Independent of (স্বাধীন): They are independent of my health.
Road to (উপায়/ রাস্তা): There is no easy road to learning.
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Idioms
Hard nut to crack (কঠিন সমস্যা): The problem of adult education is really hard nut to crack.
Make hay while sun shines (ঝোপ বুঝে কোপ মারা) You should try to make hay while sun shines.
Nip in the bud (অঙ্কুরে বিনষ্ট হওয়া): All his hopes were nipped in the bud.
Three R's (প্রাথমিক শিক্ষা)— He has not yet learnt the three R's.
Upper hand (প্রাধান্য) - He got the upper hand in the selection.