Ectoderm : ভ্রূণের বহিরা-করণ;
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Appropriate Prepositions
Bad at (অদক্ষ): He is not bad at English.
Decide upon (সিদ্ধান্ত করা): We have not yet decided whether we are going to picnic.
Entrust with (কোনো কিছু দ্বারা কাউকে বিশ্বাস করে): He entrusted me with the thing.
Married to (বিবাহিত): Salma was married to a Govt. Officer.
Monument to (স্মৃতিসৌধ): The monument to your right is a popular tourist attraction.
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Idioms
Flesh and blood (রক্তমাংসের শরীর): She's my own flesh and blood; I can't believe she treated me that way!
Null and void (বাতিল): The deed has been null and void now.
On the whole (মোটের ওপর): On the whole, his conduct is good.
Square meal (পেট ভরা আহার): He is too poor to have a square meal everyday.
See to (বিবেচনা করা)— Can you see to it that everyone gets a copy of this memo?