Relative density : আপেক্ষিক ঘনত্ব;
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Appropriate Prepositions
Authority over (কর্তৃত্ব, আধিপত্য): She has no authority over his growing daughters.
Care of(যত্ন নেওয়া): You should take care of your health.
Careful of (সতর্ক): He is very careful of his fault.
Hanker after (আকাঙ্ক্ষা/লোভ করা): He hankers after riches.
Relevant to (প্রাসঙ্গিক): Your answer is not exactly relevant to my question.
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Idioms
All at once - (হঠাৎ): I feel terribly sleepy all at once.
For good (চিরদিনের জন্য): He left the house for good.
Give one’s right arm (বিপদের ঝুকি নেয়া): I will give my right arm if I could manage the tickets.
Out of order (বিকল): The elevator was out of order.
Tooth and nail (strongly, প্রবলভাবে)-He fought tooth and nail against his enemy.