The absolute number of child deaths declined to an estimated eight-point-eight million from twelve-point-five million in nineteen ninety.
VOA: special.2009.09.28
And our other reference point is the triple point of water - reference points become zero Kelvin, absolute zero, and the triple point.
而使用绝对零度,它与压强无关,是最低的温度,另一个参考点是水的三相点。
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