Mainspring : মুখ্য উদ্দেশ্য; ঘড়ির প্রধান চালক-স্প্রিং;
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Appropriate Prepositions
Aptitude for(স্বাভাবিক দক্ষতা, যোগ্যতা): He has no aptitude for public service.
Careful of(যত্নশীল থাকা): Sadia is careful of her health.
Dedicate to (উৎসর্গ করা): His pfe is dedicated to the welfare of the country.
Due to (কারণে): His absence is due to illness.
Object to (আপত্তি করা): He objected to my proposal.
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Idioms
Beggar description - (অবর্ণনীয় হওয়া): The distress of the Muslims in Bosnia beggars description.
Eat humble pie (অপমান হজম করে ক্ষমা চাওয়া): The manager had to eat humble pie before his employees.
Learn by heart (মুখস্থ করা)— He learnt the poem by heart.
To the brim (কানায় কানায়) - The river was full to the brim.
Take to one's heels (to run away, পালানো)- They took to their heels when they saw the policeman approaching.