Ectoderm : ভ্রূণের বহিরা-করণ;
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Appropriate Prepositions
Angry for (কোন কাজে রাগান্বিত হওয়া): Rahim was angry with me for my having done this.
Cause for (চিন্তিত হওয়ার কারণ): He has never given me any cause for concern.
Cope with (এঁটে ওঠা; তাল মিলিয়ে চলা): They cannot cope with so much work.
Pleased with (সন্তুষ্ট): Shamim is pleased with all his employees.
Subsist on (বেঁচে থাকা): The poor subsist mainly on rice and pulses.
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Idioms
Do yeoman’s service (বিশেষ উপকার করা): Freedom fighters have done yeoman’s service for country.
Pass away (মারা যাওয়া)— He passed away last night.
Tooth and nail (strongly, প্রবলভাবে)-He fought tooth and nail against his enemy.
To the backbone (to the core, হাড়ে হাড়ে) —The boy is wicked to the backbone.
Worthy of (যোগ্য) - He is worthy of a good job.