Because step five is that we need to fill in our bonding electrons, and we start it with filling in two electrons per bond.

因为第五步要做的是将我们的成键电子填在这，所以我们开始在每个键处填上两个电子。

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Instead of aiming for a niche in an attempt to find a 'gap in the market', or to fill a hole that probably doesn't need filling, they cater to a wide range purposes.

它们试着满足各种广泛的要求，而不是瞄准于试图弥补某些市场的空白或者填补那些可能不必要填补的地方。

youdao

If the tank is not filling all the way (there should be a fill line on the inside of the tank), carefully bend the bulb of the float valve up a bit and see if the tank will fill.

如果水箱没有充满正常水量(水箱内侧应该有一条水位线)，慢慢地弯曲一下浮囊阀，看水位会不会上升。

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So again you can see as we're filling up our molecular orbitals, we're using the exact same principle we used to fill up atomic orbitals.

当我们填充轨道的时候可以看到，我们用的是和,填充原子轨道一样的原则。

麻省理工公开课 - 化学原理课程节选

Because step five is that we need to fill in our bonding electrons, and we start it with filling in two electrons per bond.

因为第五步要做的是将我们的成键电子填在这，所以我们开始在每个键处填上两个电子。

麻省理工公开课 - 化学原理课程节选

So carbon has four valence electrons, so if we talk about c 2, again we're going to start filling in our molecular orbitals, and now we're going to have eight electrons to fill into our molecular orbitals.

碳有4个价电子，所以如果我们考虑C2的话，同样，我们开始填分子轨道，现在我们有8个电子,要填入分子轨道。

麻省理工公开课 - 化学原理课程节选

Jayson Nix, filling in for the fill-in shortstop, Kevin Youkilis at third base and Lyle Overbay on first completed the Yankees' first triple play in the Bronx in 45 years.

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