单词学习：sluggishness 名词
sluggishness
/ˈslʌɡɪʃnəs/
迟缓，懒散，不活跃
The sluggishness of the students in the morning class was noticed by Mr. Gu, who decided to start with an energizing activity.
顾老师注意到上午课堂上学生们有些懒散，于是决定以一个提神的活动开始上课。
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