One gets a contribution from an electron outside closed shells and also a possible contribution coming from an incomplete shell or a hole in a closed shell.
化学键的形成来源于一个满壳层之外的电子，也有可能是形成于一个不完全的壳层或满壳层上的一个电子空穴。
2
And here's the one I suggest: a hairy ape man with a thick brow sits crouched, working a tiny hole into a small shell.
这里就是我的建议：一个毛茸茸的弯腰驼背的额头沉重的猿人，蹲着在贝壳上钻一个小孔。
3
First the shell begins to crack. Then there's a flurry of activity as the tiny creature curled up inside the egg breaks a hole in the shell.