To ensure the child ten hours of sleep time, many parents instruct the children to go to bed at nine o 'clock.

要保证孩子十个小时的睡眠时间，很多家长规定孩子九点钟上床睡觉。

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To ensure the child ten hours of sleep time, many parents instruct the children to go to bed at nine o 'clock.

要保证孩子十个小时的睡眠时间，很多家长规定孩子九点钟上床睡觉。

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