I hear of someone saying that English is not enough when you want to communicate with the people from different culture. I know there are lots of countries that English isn't their native language,and that must be a limit for us to know each other better. If I want to learn the third language,which one is more recommeded? I heard of Spanish is the second commomly used language in the world.Is that true?
(My native language is Mandarin.)
If you are interested in Europe and looking forward to travelling or working in EU. German would be a good choice for you to choose.
It's best to learn a language that you're personally interested in. That will keep you motivated.
If you want a language that's widely spoken, you can look at the list of United Nations official languages. I believe there are five.