Imperceptibility : অননুভবনীয়তা;
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Appropriate Prepositions
Affection for(স্নেহ): She has a great affection for the child.
Burst out a laughter(হাসিতে ফেটে পড়া) He bursts out a laughter.
Compete with(প্রতিযোগিতা করা): He does not pke to compete with
Deal in (কোনো কিছুর ব্যবসা করা): They deal in green vegetables.
Feed on (খেয়ে বাঁচা): The cow feeds on grass.
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Idioms
A bed of roses - (সুখকর অবস্থা): Life is not a bed of roses.
As a rule (নিয়ম অনুসারে.) As a rule, she kept silent in the meeting.
From cradle to grave (দোলনা থেকে কবর পর্যন্ত): Everyone has to learn from cradle to grave.
From hand to mouth (দিন আনে দিন খায়): The poor man live from hand to mouth.
Ins and out (খুঁটিনাটি): I know ins and outs of this file.