Ectoderm : ভ্রূণের বহিরা-করণ;
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Appropriate Prepositions
Appetite for(ক্ষুধা): He has no appetite for food.
Associate with, in(জড়িত হওয়া): This man was associated with crime.
Desire for (কামনা): He has no desire for fame.
Dull at (অপ্টু/কাঁচা): He is dull at mathematics.
Rule over (শাসন করা): In the absence of the Parliament, the President rules over the country.
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Idioms
Give one’s right arm (বিপদের ঝুকি নেয়া): I will give my right arm if I could manage the tickets.
In one’s teens (তের থেকে উনিশ বছর বয়সের মাঝে): She is yet in her teens.
Make both ends meet (আয় ব্যয় মেলানো): I cannot make both ends meet with my small income.
Pass sth/sb off as sth/sb (মিথ্যা পরিচয় দেয়া; Pretend – ভান করা): They were trying to pass off these shirts as genuine Armani.
To the letter (in all details, অক্ষরে অক্ষরে) —Follow my advice to the letter.