退回菜单后，通过移动轨迹球或输入键盘上的字母选择一个密钥。

After backing out of the menu, an encryption key can be selected by moving the trackball and typing characters on the keyboard.

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然后，我们运行所选择的用例并记录软件的执行轨迹 —— 也就是，执行的功能或方法序列。

Then we run the selected use cases and record the execution trace of the software -- i.e., the sequence of functions or methods that is executed.

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比如说，你担心自己所选择的职业轨迹10年后可能无法带来你期望在事业中期阶段获得薪水？

Worried, for example, that your chosen job track might not yield the sort of mid-career salary you'd like in 10 years?

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