Vacuum pump : নির্বাত অবস্থা পাম্প; ভ্যাকুয়াম পাম্প;
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Appropriate Prepositions
Covetous of(লোভী হওয়া): He is covetous of wealth.
Deaf to, of, in (না শোনা, বধির হওয়া): The boy is deaf to his father’s advice. This man is deaf of/in one ear.
Derive from (উৎসারিত হওয়া): The one has been derived from the poem.
Match for (প্রতিদ্বন্দ্বী): He is no match for me.
Pity for (করুণা, সমব্যথা): I feel pity for this helpless old man.
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Idioms
At ease (in peace or pleasure – শান্তিতে বা আরামে) A man who has enemies can not live at ease.
At the eleventh hour (at the last moment-শেষ মুহুর্তে adv.) The patient was in a dangerous condition and the doctor came at the eleventh hour.
Bear hard upon (behave rudely-নির্দয়ভাবে ব্যবহার করা - V) Never bear hard upon your servants.
In cold blood (ঠান্ডা মাথায়): They committed this murder in cold blood.
Out of date (সেকেলে): This fashion is out of date.