单词学习：courtesy 名词
courtesy
/ˈkɜːrtəsi/
礼貌，谦恭；好意，恩惠
Mr. Gu always shows great courtesy to his students, which makes his classroom a respectful environment.
顾老师总是对他的学生表现出极大的礼貌，这使得他的课堂成为一个相互尊重的环境。
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