They are on a steep learning curve.

他们学得很快。

The learning curve is steep.

学习曲线比较陡峭。

You don't face a big learning curve.

您不必面对很陡的学习曲线。

Of course, you have a learning curve.

当然，你得有一个学习的过程。

Your learning curve is greatly diminished.

对您来说，学习曲线已不存在了。