She has a good command of the Spanish language.

她精通西班牙语。

《牛津词典》

You should have a good command of either English or French.

你应该精通英语或法语。

youdao

It should be emphasized that applicants for this position should have a good command of English.

需要强调的是，此岗位的申请者应精通英语。

youdao

The prime minister's strengths were his usual ones: a good command of detail and a flair for creating dividing lines with Mr Cameron, especially on public spending.

ECONOMIST: The daily take

Up the street, one of the city's many volunteer booths is staffed by eight young people who don't have as good a command of different languages.

NPR: Thousands Practice Olympic Smiles

Nassib hit a long pass to Brandon Collins, made a couple of other perfect throws and showed good command in running an offense that he's still learning.

WSJ: QB Ryan Nassib shows poise in workouts with Giants