Commanding officer : অধিনায়ক অফিসার;
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Appropriate Prepositions
Attacked by(আক্রান্ত ব্যক্তিবাচক): He has been attacked by a gang of robbers.
Bad at (অদক্ষ): He is not bad at English.
Care of(যত্ন নেওয়া): You should take care of your health.
Conform to (নিয়মনীতি অনুসরণ করা): The employees have to conform to a strict dress code.
Contribution to (অবদান): His invention made a major contribution to road safety.
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Idioms
Bird’s eye view - (ভাসা ভাসা দৃশ্য, হালকাভাবে দর্শন): We took a bird’s eye view of the scenery.
Gain Ground (সুবিধা পাওয়া): The wise are said to gain the ground in the long run.
In black and white – (লিখিতভাবে) – Put forward your proposal in black and white.
Tooth and nail (strongly, প্রবলভাবে)-He fought tooth and nail against his enemy.
Wild goose chase (useless pursuit, পন্ডশ্রম) —Do not waste time in wild goose chase.