As is mentioned above, English is easy to learn.

正如上文所提到的，英语很容易学。

Employment as is mentioned above is unsuccessful.

这样的就业是不成功的。

I, as is mentioned above, am in favor of the latter view.

如上所述，我支持后者的观点。

As is mentioned above, the function of this steering tool is wonderful.

如上述，这种定向工具功能十分出色。

As is mentioned above, the number of students in high schools is increasing.

正如上面所提到的那样，高中生的数量在不断增加。