Aperture : ছিদ্র, গর্ত;
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Appropriate Prepositions
Arrive at(উপস্থিত হওয়া, পৌছানো): The train arrived at Dhaka station on time.
Dwell upon (আলোচনা করা): They dwell long upon the matter.
Married to (বিবাহিত): Salma was married to a Govt. Officer.
Stare at (চাওয়া বা তাকানো): He stares at me.
Subsist on (বেঁচে থাকা): The poor subsist mainly on rice and pulses.
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Idioms
All at once - (হঠাৎ): I feel terribly sleepy all at once.
Gala day (বিশেষ দিন): The Eid–Ul-Fitr is a gala day for Muslims.
Make hay while sun shines (ঝোপ বুঝে কোপ মারা) You should try to make hay while sun shines.
Run a risk (ঝুকি নেয়া) — He ran a risk to save his life.
Set something right (ঠিক করা)— He will set the machine right.