Infrasonic : অবশ্রব্য;
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Appropriate Prepositions
Dependent on (নির্ভরশীল): Sepm is dependent on his father.
Descend on (আক্রমণ করা): Armed thieves descended on the helpless girl.
Dull at (অপ্টু/কাঁচা): He is dull at mathematics.
Easy of (সরল): The teacher is easy of approach.
Hostile to (বিরোধী বা বিরূপ ভাবাপন্ন): Nobody is hostile to you.
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Idioms
At death’s door (at the point of death- মৃত্যুর দ্বারে) The patient is now at death’s door.
Maiden speech (প্রথম বক্তৃতা): His maiden speech fell flat on the audience.
With the sweat of one’s brow (মাথার ঘাম পায়ে ফেলে) — He earns his livelihood with the sweat of his brow.
With a lavish hand (মুক্ত হস্তে)— Give away something with a lavish hand.
With might and main (যথা শক্তি দিয়ে) —He tried with might and main to help me.