Our Walker is 2 and a half, and he is not the only child diagnosed with diabetes.

我们的沃克现在2岁半，而他并不是唯一一个患糖尿病的孩子。

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Previously, the purpose of this stage was unclear, but the new results offer evidence as to why humans spend at least half their sleeping hours in stage 2, non-REM, Prof Walker said.

沃克教授说，以前，这个阶段的目的不明确，但是，新的研究结果提供了证据，说明为什么人类在无快速眼动的第二阶段至少要用半个小时的睡眠时间。

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Previously, the purpose of this stage was unclear, but the new results offer evidence as to why humans spend at least half their sleeping hours in stage 2, non-REM, Prof Walker said.

沃克教授说，以前，这个阶段的目的不明确，但是，新的研究结果提供了证据，说明为什么人类在无快速眼动的第二阶段至少要用半个小时的睡眠时间。

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