Wave length : তরঙ্গদৈর্ঘ্য; মধ্যবর্তী ব্যবধান; একটি তরঙ্গের চূড়া হইতে অন্য তরঙ্গের চূড়ার দূরত্ব;
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Appropriate Prepositions
Appoint to(নিযুক্ত করা/হওয়া): Kibria has been appointed to the post of Headmaster.
Assure of(আশ্বাস দেওয়া): I can assure you of the Principal’s honesty.
Bark at(ঘেউ ঘেউ করা): The dog is barking at the strange woman.
Derive from (উৎসারিত হওয়া): The one has been derived from the poem.
Hanker after (আকাঙ্ক্ষা/লোভ করা): He hankers after riches.
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Idioms
Bring to light (disclose-প্রকাশ করা) The police brought the secret to light.
Hold water (ধোপে টেকা): This policy will not hold water in this situation.
Run short (কমতি পড়া) —I ran short of money.
Seventh heaven – (মহাখুশী) – I was in the seventh heaven when I heard the news of my BCS final result.
Slip of the tongue (বলায় সামান্য ভুল): This is a slip of the tongue; don’t pay much stress on it.