This is the essence of this case. We will try to remind all the time that this is the issue, this is the topic.
VOA: standard.2009.10.26
And then, if we have time at the end, we'll introduce one last topic, which is isoelectronic atoms and ions.
最后,如果有时间的话,我们将再介绍最后一个主题:,等电子原子与离子。
But at the same time you'd like to move on to the next topic.
但同时,你也想进入下一个话题了。
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