这个问题就是，可选参数没有明确指出它们打算设置哪个选项。

The problem is that the optional arguments have nothing explicit to indicate which option they are supposed to set.

youdao

但是，在这个例子中，可选参数的排序与其说是一个有利条件，倒不是说是个麻烦，它们的选项很容易被搞混，这会导致微妙的身份识别错误。

But, in this example, the order of the optional arguments is more a nuisance than a benefit and their positions are easily confused, which can lead to subtle errors of misidentification.

youdao

使用 db2admin 作为用户名并设置一个密码（可选地，您可以选择 LocalSystem 帐户，但如果使用这个选项，会带来一些限制 — 单击 Help 了解更多信息）。

Use db2admin as the user name, and set a password. (Optionally, you can select the LocalSystem account, but there are limitations introduced if this option is used — click Help to learn more.)

youdao