Pneumatic trough : গ্যাসদ্রোণী;
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Appropriate Prepositions
Concerned with(জড়িত): She was concerned with such things.
Fatigued by (ক্লান্ত): He was fatigued by hard work.
Make of (কোনো উপকরণ দ্বারা সরাসরি তৈরী বোঝাতে): This necklace is made of gold.
Urge upon (আহবান জানানো): She urged upon his son the importance of being honest.
Worry about (কোনো কিছু বা কাউকে নিয়ে উদ্বিগ্ন হওয়া): Please, don’t worry about me. I will be alright.
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Idioms
At least (in the lowest estimate- কমপক্ষে) He is the owner of thirty lakh taka at least.
Bad names (গালমন্দ—n) He called the man bad names.
Fair and square (সৎ): The learned persons should be fair and square.
Slow coach (অলস): You cannot expect much from a slow coach.
Three R's (প্রাথমিক শিক্ষা)— He has not yet learnt the three R's.