They are on a steep learning curve.

他们学得很快。

《柯林斯英汉双解大词典》

Perhaps the power and depth of Eclipse means that you have a steep learning curve.

或许 Eclipse 的强大和深度意味着您学习起来会很费劲。

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Ian survived basic training, but he faced a steep learning curve when it came to everyday Army life.

伊恩挺过了基础训练，但现在他又要重新面对日常正式军旅生活的挑战。

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But stenography is a steep learning curve and more difficult to learn than Qwerty.

BBC: Why do we all use Qwerty keyboards?

Some in the U.S. military see a steep learning curve ahead for the 350, 000 Afghan service personnel.

NPR: Fighting Season Is Testing Ground For Afghan Force

Warren, however, believes the 26-year-old Londoner can only benefit from such a steep learning curve in what will be only his 15th fight.

BBC: James DeGale (right) in action against Carl Dilks