B2 polite behaviour, or a polite action or remark謙恭有禮的舉止,禮貌;禮節;客氣話
by permission of承蒙…的允許
because of因爲,由於
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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