When Qian Weigang met Zhao Zhouhang, Zhao Zhouhang didn't understand her thoughts. He spoke to Qian Wei in another language. Qian Wei asked what exactly Zhao Zhouhang was saying, but she didn't understand, and neither did Zhao Zhouhang. A week later, Zhao Zhouhang could already use the language of the earth.
Qian Wei thought that Zhao Zhouhang was pretending before, otherwise, as a suspected alien, how could he learn Chinese so quickly.
Purpose: Exploration