This is methane: carbon bonded to four hydrogens.

碳原子和四个氢原子结合。

In a study published this year in the journal Science Advances, researchers used a DAC to combine water and liquid methane, or one carbon bonded to four hydrogens.

在今年《科学进展》发表的一项研究中，科学家用DAC将水与液态甲烷或四氢化碳溶合。

If I look at one of these molecules of acetone here and I focus in on the carbon that's double bonded to the oxygen, I know that oxygen is more electronegative than carbon.

如果我在这里观察其中一个丙酮分子， 并关注与氧双键结合的碳，我就会知道氧比碳更具电负性。