Ectoderm : ভ্রূণের বহিরা-করণ;
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Appropriate Prepositions
Bark at(ঘেউ ঘেউ করা): The dog is barking at the strange woman.
Enter into (আলোচনা করতে আরম্ভ করা): Let’s not enter into details at this stage.
Hinge on/upon (নির্ভর করা): The whole matter hinges upon this clue.
Send for (ডেকে পাঠানো): Send for a doctor immediately.
Suffer from (অসুখে ভোগা, কষ্ট পাওয়া): He has been suffering from fever for last three days.
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Idioms
At a snail's pace (very slowly – খুব ধীর গতিতে) The economy of Bangladesh is growing at a snail’s pace.
Back and forth (এদিক ওদিক) The mad man was running back and forth in the hospital.
Fish out of water (অস্বস্তিকর অবস্থা): When he came to the village, he felt like fish out of water.
For good (চিরদিনের জন্য): He left the house for good.
Get rid of (মুক্তি পাওয়া): Try to get rid of the rogue.