Infrasonic : অবশ্রব্য;
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Appropriate Prepositions
Anxious about (কোনো কিছুর ব্যাপারে চিন্তিত বা উদ্বিগ্ন): Karim is anxious about his father’s death. Karim is anxious for getting a job.
Ascend to (আরোহণ করা): karim began to ascend to the surface of wakefulness.
Conscious of(সচেতন): I am conscious of my deficiencies.
Refrain from (বিরত রাখা বা থাকা): I refrained him from smoking.
Stick to (দৃঢ়ভাবে লেগে থাকা): We should always stick to our decisions.
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Idioms
From cradle to grave (দোলনা থেকে কবর পর্যন্ত): Everyone has to learn from cradle to grave.
Steer clear of (avoid, দূরে থাকা)— You must steer clear of evil company.
Take to one's heels (to run away, পালানো)- They took to their heels when they saw the policeman approaching.
To the letter (in all details, অক্ষরে অক্ষরে) —Follow my advice to the letter.
Well-to-do (সঙ্গতিপূর্ণ) - He was not born in a well-to-do family.