He has a good grasp of German grammar.

他德语语法掌握得很好。

《牛津词典》

They have a good grasp of foreign languages.

他们很好地掌握了各门外语。

《柯林斯英汉双解大词典》

In order to have a good grasp of a culture, learning its language is the best way.

想要掌握一种文化，最好的办法是学习其语言。

youdao

"We'll need to wait for all the girls to enter puberty before we have a good grasp on what the contribution is of those environmental chemicals."

VOA: special.2010.08.18

She has a good grasp of the material.

她对这个材料有很好的理解。

麻省理工公开课 - 固态化学导论课程节选

And so we don't have a very good grasp of the Platonic forms.

我们无法对柏拉图式的型相有深入了解

耶鲁公开课 - 死亡课程节选

But the Department for Education defended claims that "many children don't have a good grasp of historical facts".

BBC: Hunt doubts Gove on history evidence

And since the options are somewhat limited, it is very easy to get a good grasp on the world of Irish Whiskey.

FORBES: Complete Guide to Irish Whiskey

Make sure you have a good grasp of the periodic table, too.

FORBES: NASA Launches A Facebook Game