Hydraulic gradient : জলীয় অবক্রম;
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Appropriate Prepositions
Apathy towards (অনাগ্রহ): The student has great apathy towards his studies.
Compete with(প্রতিযোগিতা করা): He does not pke to compete with
Enter into (কোনো কিছুতে আবদ্ধ হওয়া): pma entered into a new agreement.
Genius for (দক্ষতা): Nazrul had a genius for convincing girls.
Hit upon (পরিকল্পনা নেয়া): Rahim hit upon a new plan.
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Idioms
At one’s elbow (near at hand — হাতের কাছে – adv.) His private secretary is always at his elbow.
Bear in mind (remember— মনে রাখা —V): You should also bear in mind the additional costs of the mortgage.
On the contrary (বিপরীত পক্ষে): I do not hate him; on the contrary I love him.
Tooth and nail (তীব্রভাবে): He fought tooth and nail for the sake of country.
Wild goose chase (useless pursuit, পন্ডশ্রম) —Do not waste time in wild goose chase.