Dielectric : অস্তরক;
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Appropriate Prepositions
Entrust to (কাউকে কোনো কিছু বিশ্বাস করে দেওয়া): He entrusted the thing to me.
Hostile to (বিরোধী বা বিরূপ ভাবাপন্ন): Nobody is hostile to you.
Independent of (স্বাধীন): They are independent of my health.
Quick at (চটপটে): A cashier must be quick at figures.
Succeed in (সাফল্য লাভ করা): He succeeded in life.
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Idioms
At one’s elbow (near at hand — হাতের কাছে – adv.) His private secretary is always at his elbow.
Learn by heart (মুখস্থ করা)— He learnt the poem by heart.
On the contrary (বিপরীত পক্ষে): I do not hate him; on the contrary I love him.
Pros and cons (খুঁটিনাটি): You should consider the pros and cons of the system.
Stone’s throw (অতি নিকটে): Our school is at a stone’s throw from our house.