In fact, it is converted to folate in the liver by the addition of four hydrogen atoms.

事实上，它在肝脏中与四个氢原子结合后转化成叶酸。

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During the final stage, the water is disinfected - by the addition of chlorine, hydrogen peroxide and other chemicals and by running it past ultraviolet lights.

在最后一个步骤中，水经过氯、过氧化氢和其它化学品消毒，并且经过紫外线灯消毒。

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Hydrogen brittleness: because, in addition to the erosion oil or plating process such as metal and alloy hydrogen atom absorption and cause brittle.

氢脆：由于浸蚀，除油或电镀等过程中金属或合金吸收氢原子而引起的脆性。

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So in addition to having these two carbon bonds, we actually also have four carbon hydrogen bonds in addition to our carbon-carbon bonds.

在这碳碳之间的键以外，我们还有四个碳氢键,除了我们的碳碳键外。

麻省理工公开课 - 化学原理课程节选

In addition, hydrogen pipelines cost six times as much as natural gas conduits, according to the International Energy Agency.

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