Ectoderm : ভ্রূণের বহিরা-করণ;
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Appropriate Prepositions
Call on(কারও সাথে দেখা করা): I called on him in his office.
Convert to(দীক্ষিত): Tom is converted to another religion.
Die from (কোন কিছু জন্য মারা যাওয়া): The poor person died from hunger.
Qualified for (যোগ্য প্রতিপন্ন হওয়া): No candidate was properly qualified for the post.
Sick of (ক্লান্ত): He is sick of this idle life.
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Idioms
At one’s elbow (near at hand — হাতের কাছে – adv.) His private secretary is always at his elbow.
As a rule (নিয়ম অনুসারে.) As a rule, she kept silent in the meeting.
Flesh and blood (রক্তমাংসের শরীর): She's my own flesh and blood; I can't believe she treated me that way!
Lose one’s heart (প্রেমে পড়া) — He lost his heart to the girl.
Part and parcel (অবিচ্ছেদ্য অংশ): Education is part and parcel to build a civilized nation.