名词
中文翻译：中心
同义词：
['central', 'focal point', 'main focus例句：1. The center of the city is bustling with activity.（市中心熙熙攘攘。）']
例句：
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1. The center of the city is bustling with activity.
市中心熙熙攘攘。
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2.The project's central idea was to improve efficiency.
该项目的核心理念是提高效率。
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3. The teacher focused on the students in the front row.
老师把注意力集中在前排的学生上。