我已经掌握了2000多个英语单词。

I have mastered more than 2000 English words.

youdao

经过暑假训练，我已经掌握了游泳技巧。

After the summer training, I mastered the skills of swimming.

youdao

永远没有一个时候你可以真正地说：“我已经掌握了英语。”总有更多的东西要学，总还有提高的空间。

There is never a point when you can truly say, " I have mastered English. " There is always more to learn and room to improve.

youdao

Even though I wrote the presentation, I feel like I don't know the information well.

即便我已经把报告写下来了，我还是觉得我没有好好掌握其中的内容。

I'm worried 实战 - SpeakingMax英语口语达人