不像其它的工具，您必须手动地一级一级地挖掘。

Instead of other tools, you have to manually drill down level by level.

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通往成功的路上没有电梯，你只能去一级一级爬楼梯。

There is no elevator to success; you have to take the stairs.

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后来一级一级学校都能上去，学习成绩都能优秀，都是那段孩时苦垫的底。

Later, the school can get a level, academic performance can be excellent, all the time that children suffer at the end of the pad.

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Well, if we look on the chart, the first ionization energy is what is reported in your Periodic Table.

如果我们查阅图表，一级电离能,已经在元素周期表上标示了。

麻省理工公开课 - 固态化学导论课程节选

Then there's a formula that dictates how much Tier I capital and how much Tier II capital they have to hold.

还有一个公式可以计算出,他们必须持有,多少一级资本和多少二级资本

耶鲁公开课 - 金融市场课程节选

We call these first, second, third ionization energies in sequence. This is the first ionization energy.

我们按照顺序把这些叫做一级，二级,三级电离能，这是初级电离能。

麻省理工公开课 - 固态化学导论课程节选