Spherical aberration : গোলাপেরণ;
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Appropriate Prepositions
Depend on (নির্ভর করা): Presently, the students depend on/upon guide books.
Heir of (উত্তরাধিকারী): He is the heir of his father.
Innocent of (নির্দোষ): The maid servant was proved innocent of the alleged theft.
Repent on (নির্ভরশীল): He is repent on his parents.
Subsist on (বেঁচে থাকা): The poor subsist mainly on rice and pulses.
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Idioms
Fish in a troubled water (এলোমেলো অবস্থার সুযোগ নেয়া): He made a lot of money by fishing in a troubled water.
Liable to mislead (প্রতারণাপূর্ণ- deceptive): Appearances can often be liable to mislead.
Learn by heart (মুখস্থ করা)— He learnt the poem by heart.
Tooth and nail (তীব্রভাবে): He fought tooth and nail for the sake of country.
To the letter (in all details, অক্ষরে অক্ষরে) —Follow my advice to the letter.