Magnetic core : চৌম্বক কোর;
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Appropriate Prepositions
Abide in(বাস করা): I abide in Dhaka with my family.
Arrange for(ব্যবস্থা করা): We have arranged everything for our study tour.
Covetous of(লোভী হওয়া): He is covetous of wealth.
Rejoice at/in (আনন্দ করা): Everybody rejoiced at/in his success.
Relevant to (প্রাসঙ্গিক): Your answer is not exactly relevant to my question.
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Idioms
At dead of night (গভীর রাতে) The police caught the thief at dead of night.
Back and bally (জীবিকা, ভরণ পোষণ—n) Who will provide the increasing population with the required back and bally?
From hand to mouth (দিন আনে দিন খায়): The poor man live from hand to mouth.
Take to heart (মর্মাহত হওয়া)- He really took it to heart when I asked him to reconsider.
White color job – (উচ্চ শ্রেনীর চাকরি, যেখানে শারীরিক কাজ নেই বললেই চলে- a job without manual labour) - He wants a white color job.