You only really get proficient after many years in the job.

在这一行工作很多年后，你才能真的更加熟练。

youdao

The ultimate objective of this book is for you to be able to quickly play HT with practically no HS practice after you become proficient.

本书最终的目标是让你尽快地开始合手弹奏，精通后跟本不需要分手练习，而不是养成依赖分手练习的习惯。

youdao

You may never forget how, but how proficient are you when you first return to bike riding after a number of years of inactivity?

你也许从来不会忘掉如何骑，但是当你很多年没有骑的时候，重新去骑的时候就没有多少熟练了。

youdao

The House bill calls upon schools to certify their students are proficient in English after they have logged at least three years in U.S. classrooms.

CNN: Bush impatient with Congress on education bill