There is not a simple answer. It depends on the subject and level of students,of course.
VOA: special.2009.12.17
It's not a simple matter. Imagine what it would be like if you had to learn about sixty such things?
绝不是个简单的事,想象一下如果你得学,六十个字母会是什么状况
Not on the basis of simple filling in ascending order, but a modified rate of filling as according to the Aufbau Principle.
并不是以简单的升值分布为基础,而是一个修改的填充方法,根据构造原理得到的填充法。
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