Ectoderm : ভ্রূণের বহিরা-করণ;
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Appropriate Prepositions
Apology to (কারো কাছে ক্ষমা চাওয়া): Rakib should ask apology to her.
Congratulate on(অভিনন্দন জানানো): They congratulated me on my brilliant success.
Defend against (রক্ষা করা): We will defend our country against all enemies.
Relation with (সম্পর্ক): I have no relation with the culprit.
Shout at (চিৎকার করে ডাকা): Do not shout at your parents.
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Idioms
At the eleventh hour (at the last moment-শেষ মুহুর্তে adv.) The patient was in a dangerous condition and the doctor came at the eleventh hour.
Bad book (disfavour-খারাপ নজর —n) The secretary has fallen in the bad book of the manager.
Call to mind (স্মরণ করা): I cannot call to mind your cell number.
Red tape (official formalities, অফিসের কাজ)— You would not believe the red tape involved in getting the required permits.
White color job – (উচ্চ শ্রেনীর চাকরি, যেখানে শারীরিক কাজ নেই বললেই চলে- a job without manual labour) - He wants a white color job.