很遗憾，我方不能以船上交货报价，因为按照惯例我方与客户做生意通常报到岸价价。

Wee regret being unable to quote on FOB basis, as it is our general practice to do business with all our clients on CIF terms.

youdao

碳的化合价是4价。

Carbon has a valency of 4.

《牛津词典》

二价铁能还原成三价铁。

Ferrous iron reduces to ferric iron.

youdao

I can then subsequently lose an electron from the lithium ion. Lithium ion loses an electron to become lithium 2plus.

然后我能在锂离子中，失去一个电子,锂离子失去一个电子,变为二价锂离子。

麻省理工公开课 - 固态化学导论课程节选

And, likewise, if we look at fluorine in its diatomic molecule, it is 160 kilojoules per mole.

一样的，如果我们观察二价的氟，它是每摩尔160焦。

麻省理工公开课 - 固态化学导论课程节选

So in terms of total numbers that we would need to complete our octets and fill our valence shells, we would need 18 electrons.

因此要填满我们的“八隅体“,排满所有的价壳层，我们总共需要十八个电子。

麻省理工公开课 - 化学原理课程节选