Heliograph : সূর্যকিরণ সাহায্যে সংকেত পাঠাইবার যন্ত্র
Related Words
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Appropriate Prepositions
Care of(যত্ন নেওয়া): You should take care of your health.
Indifferent to (উদাসীন): Everybody is indifferent to my problem.
Qualified for (যোগ্য প্রতিপন্ন হওয়া): No candidate was properly qualified for the post.
Rebel against (বিদ্রোহ করা): The soldiers rebelled against the king.
With a view to (উদ্দেশ্য): I went to hospital with a view to seeing you.
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Idioms
At dead of night (গভীর রাতে) The police caught the thief at dead of night.
Learn by heart (মুখস্থ করা)— He learnt the poem by heart.
Ups and downs (উত্থান পতন)- There is ups and downs in a man's life.
White elephant (অত্যন্ত ব্যয়সাপেক্ষ বিলাসিতা): At last the department proved to be a white elephant.
Wild goose chase (useless pursuit, পন্ডশ্রম) —Do not waste time in wild goose chase.