Pathogen : রোগজনক শক্তি;
Related Words
patching  pathogen  pathogenic  pathogenicity  pathognomic  See Words Also In
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Appropriate Prepositions
Dwell upon (আলোচনা করা): They dwell long upon the matter.
Loyal to (অনুগত): Every citizen must be loyal to the state.
Refrain from (বিরত রাখা বা থাকা): I refrained him from smoking.
Regret for (দুঃখ করা): We regretted for his failure.
Search for (সন্ধান করা): The police searched the halls of residence for arms.
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Idioms
At a round rate (at the fixed price – নির্ধারিত মূল্যে) Things are selling in the shop at a round rate.
At last (in the end – অবশেষে) He tried hard, and at last, succeeded in achieving his goal.
In a nutshell (সংক্ষেপে): Tell the whole story in a nutshell.
In the long run (পরিণামে): You will have to suffer in the long run.
With might and main (যথা শক্তি দিয়ে) —He tried with might and main to help me.