Now the last thing is that because the neutron has no net charge, we can change neutron number.

现在，最后一件事是,因为中子没有净电子，我们可以改变中子数。

麻省理工公开课 - 固态化学导论课程节选

We only have the one bond so the actual HF molecule is polar, it has a net dipole.

但HF中只有一根键,所以分子也是极性的而甲烷中有一个网状偶极。

麻省理工公开课 - 固态化学导论课程节选

net For those unfamiliar this is a website at courses.cs50.net and has the entire Harvard Course catalog in it and what it has at top left as you might see is definitely your Facebook login button.

还不熟悉的同学可以登录courses。cs50。,整个哈佛大学的课程目录都在上面,在这个网页的左上角,可以看到Facebook的登录链接键。

哈佛公开课 - 计算机科学课程节选