Due to DC arc extinguishing current has no natural zero-crossing point, so, DC arc can only been extinguished by forced zero-crossing-over.

由于直流熄弧电流不存在自然的过零点，因此必须强制过零才能熄灭直流电弧。

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This means that it is neither sugar, nor a purely artificial sweetener, but is instead what Cargill calls a "natural" zero-calorie sweetener.

这就意味着，该产品既非糖类，亦非纯粹的人造甜味剂，而是嘉吉公司所说的“天然”无卡甜味剂。

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The price of natural gas will never go down to zero.

天然气的价格永远也不会降到零。

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What we define as zero is the enthalpy of every element in its natural state at room temperature and ambient pressure.

我们将零点定义为每种元素,在室温和正常大气压下,在其自然状态下的焓。

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Instead we must move the natural rate to zero.

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This time, she hopes to visit the American Museum of Natural History and the ground zero memorial.

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The proposal lumps gas turbines and coal boilers into the same source category, and it holds coal power plants to a CO2 performance standard that nearly all natural gas combined cycle plants and exactly zero commercial coal power plants can meet.

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