Crash helmets : শিরস্ত্রাণ;
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Appropriate Prepositions
Cause of(কারণ): Industry is the cause of your success.
Count upon(নির্ভর করা): He always counts upon your help for this work.
Die for (আত্নত্যাগ করা): Our Chairman died for our country.
Regret for (দুঃখ করা): We regretted for his failure.
Repent of (অনুতাপ করা): I repented of my past.
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Idioms
All at once - (হঠাৎ): I feel terribly sleepy all at once.
As a rule (নিয়ম অনুসারে.) As a rule, she kept silent in the meeting.
On the wane (হ্রাসমান): His fame is on the wane now.
Tide over (বিপদ অতিক্রম করা-overcome ): The manager tided over the situation.
To the contrary (against what some one had said, পক্ষান্তরে) —He said nothing to the contrary.