Angle of incidence : আপতন কোণ;
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Appropriate Prepositions
Call in(ডাকিয়া আনা): They called in a doctor.
Deal in (কোনো কিছুর ব্যবসা করা): They deal in green vegetables.
Die of (রোগে মরা): Many people died of cholera.
Guard from/against (রক্ষা করা): My parents always guard me from/against bad people.
Make up of (গঠিত): Village is made up of many homes.
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Idioms
At random (indiscriminately—এলোপাথাড়ি-adv.) He talks at random like a mad man.
Hue and cry (শোরগোল): The villagers raised a hue and cry to see the thief.
Maiden speech (প্রথম বক্তৃতা): His maiden speech fell flat on the audience.
Make both ends meet (আয় ব্যয় মেলানো): I cannot make both ends meet with my small income.
With might and main (যথা শক্তি দিয়ে) —He tried with might and main to help me.