Master a foreign language,掌握一门外语。
双语例句
对我们来说掌握一门外语多重要啊!
How important it is for us to master a foreign lauguage!
当今掌握一门外语真的很重要。
To master a foreign language is really important nowadays.
他们认为大学生掌握一门外语是很必要的。
They think it necessary for college students to grasp one foreign language.