Valves : কপাটক; বেতারের যন্ত্রবিশেষ; গতিনিয়ন্ত্রক কল; বিদ্যুতের যন্ত্রবিশেষ;
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Appropriate Prepositions
Assure of(আশ্বাস দেওয়া): I can assure you of the Principal’s honesty.
Bridge over (সেতু): The only entrance to Allahabad in that direction was by a bridge over the Jumna.
Careful of(যত্নশীল থাকা): Sadia is careful of her health.
Count on/upon (নির্ভর, বিশ্বাস করা): Rahim count on (upon) my help.
Refrain from (বিরত রাখা বা থাকা): I refrained him from smoking.
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Idioms
Fair and square (সৎ): The learned persons should be fair and square.
Hush money (ঘুষ): He offered a hush money to disclose the file.
Moot point (অমীমাংসিত বিষয়): Dowry system is still a moot point in Bangladesh.
Rank and file (সাধারণ লোক): We should pay attention to the rank and file of the country.
Widow’s mite (দরিদ্রের ক্ষুদ্র দান): A windows mite is no less important than a large contribution of a rich man.