Astronaut training engineers, technicians, pilots, and geologists. In addition there will be a focus on the psychological aspects of long-duration missions where crew is largely isolated. Currently a six-month mission to the ISS requires up to five years of astronaut training. This level of training is to be expected and likely to be expanded upon for future space exploration missions. It may also include in-flight training aspects. It may be possible that the ISS will be used as a long-duration astronaut training facility in the future. A powerful tool for astronaut training will be the continuing use of analog environments, including NASA
Chinese as a foreign language characters already listed above. In his 1991 article "Why Chinese is So Damn Hard", David Moser states that an English speaker would find the "ridiculous" writing system "unreasonably hard to learn" to the level of achieving literacy due to the large number of characters. Moser argued that he was unable to "comfortably read" a newspaper even though he knew 2,000 characters. The 17th-century Protestant theologian Elias Grebniz, said that Chinese characters were: In Gautier's novella "Fortunio", a Chinese professor from the Collège de France, when asked by the protagonist to translate a love letter suspected to be written in Chinese,