中等教育包含了十年级到十二年级。

Secondary education comprised grades ten through twelve.

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美国中学通常包括六到十二年级在内的七个年级。

Secondary school in the us usually covers seven years, grades six to twelve.

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美国中学通常包括六到十二年级在内的七个年级。

Secondary school in the us usually covers seven years, grades six to twelve.

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