Oxygen mask : অক্সিজেন মাস্ক; অক্সিজেন-মুখোশ;
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Appropriate Prepositions
Deprived of (বঞ্চিত): He was deprived of education due to extreme poverty.
Inquire into (খতিয়ে দেখা): The police officer will inquire into the matter.
Relevant to (প্রাসঙ্গিক): Your answer is not exactly relevant to my question.
Road to (উপায়/ রাস্তা): There is no easy road to learning.
Take pity on (দয়া করা): Take pity on the helpless people.
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Idioms
Cut a sorry figure (খারাপ ফল করা): He cuts a sorry figure in the examination.
In full swing (পুরোদমে): The school is in full swing after the vacation.
Laughing stock (হাসির পাত্র)— He is a laughing stock to all.
Three R's (প্রাথমিক শিক্ষা)— He has not yet learnt the three R's.
Up and doing (উদ্যোগী): Be up and doing and then you will succeed in your life.