Spirometer : ফুসফুসের ক্ষমতা-পরিমাপক যন্ত্র;
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Appropriate Prepositions
Akin to(সমজাতীয়): These are akin to one another.
Based on(প্রতিষ্ঠিত, ভিত্তিক): His information is not based on the correct information.
Control over(নিয়ন্ত্রণ): He has no control over his sons.
Defend against (রক্ষা করা): We will defend our country against all enemies.
Rely on (নির্ভর করা): We should not rely on a lazy man.
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Idioms
Arm in arm (পরস্পর সম্পর্কিত বিষয়) All good people should live arm in arm with one another.
Fish in a troubled water (এলোমেলো অবস্থার সুযোগ নেয়া): He made a lot of money by fishing in a troubled water.
Learn by heart (মুখস্থ করা)— He learnt the poem by heart.
Red letter day (স্মরণীয় দিন): The 16th December is a red letter day for us.
To go to the dogs (গোল্লায় যাওয়া)- He has gone to the dogs by keeping evil company.