Ventilators : বায়ুরন্ধ্র; বাতায়ন;
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Appropriate Prepositions
Answerable to (কারো কাছে জবাবদিহিতা করা): He is not answerable to anybody for his mistake.
By heart (মুখস্থ): Kamal learnt to poem by heart.
Desire for (আকাঙ্ক্ষা করা): He has no desire for money.
Feed on (খেয়ে বাঁচা): The cow feeds on grass.
Stick to (দৃঢ়ভাবে লেগে থাকা): We should always stick to our decisions.
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Idioms
A bed of roses - (সুখকর অবস্থা): Life is not a bed of roses.
Hold water (ধোপে টেকা): This policy will not hold water in this situation.
Ins and out (খুঁটিনাটি): I know ins and outs of this file.
Make both ends meet (আয় ব্যয় মেলানো): I cannot make both ends meet with my small income.
Tooth and nail (strongly, প্রবলভাবে)-He fought tooth and nail against his enemy.