The author speaks many languages, Including English, Mandarin, Cantonese, French, Japanese and Tagalog. He speaks the most fluent of fluent English. English is his native language. But during a period of time when he was 24 year-old, he found his english had deteriorated to the level of 15 year-old. It is because he had not used English to communicate for a long period of time. His experience demonstrated that language is like a muscle, you need to use it or lose it.
     He learned to speak french when he was in high school. He felt french boring at first. Fortunately a turning point came to his life. He attended an exchanging students plan. A french spoken boy came to his home to stay for two weeks. After that he went to the boy’s home to stay for another two weeks. During this time, he had learned to speak french. He sailed through to the end of  high school without any hard work on french. He did not mention if he is still able to speak french now. I believe that if it is needed, he will get the skill of speaking french again very soon.
      He speaks Mandarin and cantonese fluently. From the time since he had learned to speak Mandarin and cantonese, he used both of these languges to interact at his organizational consulting work, so he never lost them.
     He often traveled to many countries in Asia. He ever exposed to many asian languages as well. He had achived the stage that when he comes across a new language, he is quickly able to have a feel about how this language works and get the rules of how the words of the new languages are sticked together to create meanings. Therefore once he comes to a new country, just in a few days, he can hitchhike around the country in the local language and converse with the local people. He has gained this talent like a part of heritage. These languages might have not stayed with him because he had not contacted with them afterwards.
    Being able to learn a new language quickly, I think the secret of which is that you should treat a language just as a tool to communicate. Soak your brain in the new language then notice the patterns and the rules of it. Build the connection between the audibol of the language to your feeling and imagine of the object. Think in the new language. Be bold. Be confident. Go to communicate in the new language. Then quickly you can master it.