B2 polite behaviour, or a polite action or remark谦恭有礼的举止,礼貌;礼节;客气话
by permission of承蒙…的允许
because of因为,由于
More examples
He replied sharply, and without his wonted courtesy.
At least do him the courtesy of listening to what he has to say.
He did have the courtesy to thank her for her efforts.
Always hold the door for the person behind you - it's just common courtesy.
She treated them with the greatest courtesy.
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