"数" 错了, 应该是:
the high school years is a key period
高中是一个关键时期
双语例句
1
Song Dynasty is a key period for the great development of teaculture.
宋代是中国历史上茶文化大发展的一个重要时期。
2
The Qing Dynasty was a key period that the Chinese traditionaleducation pattern had changed to moderation.
清朝又是中国传统办学模式转向近代教育形式的关键时期。
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