Conchology : শঙ্খবিদ্যা;
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Appropriate Prepositions
Abstain from(বিরত থাকা): I am trying to abstain from sweets for my new diet.
Bad at (অদক্ষ): He is not bad at English.
Caution against(সাবধান): Take all cautions against the danger.
Convinced of (আশ্বস্ত): You are convinced of his product.
Due to (কারণে): His absence is due to illness.
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Idioms
At home (proficient in — দক্ষ) The students of Bangladesh should be at home in Bangla.
Back and forth (এদিক ওদিক) The mad man was running back and forth in the hospital.
Take to one's heels (to run away, পালানো)- They took to their heels when they saw the policeman approaching.
To the backbone (to the core, হাড়ে হাড়ে) —The boy is wicked to the backbone.
Weal and woe (সুখ-দুঃখ): Human life is full of weal and woe.