Astronaut limit water use to only about three gallons (11 liters) per day. In Russia, cosmonauts are awarded Pilot-Cosmonaut of the Russian Federation upon completion of their missions, often accompanied with the award of Hero of the Russian Federation. This follows the practice established in the USSR where cosmonauts were usually awarded the title Hero of the Soviet Union. At NASA, those who complete astronaut candidate training receive a silver lapel pin. Once they have flown in space, they receive a gold pin. U.S. astronauts who also have active-duty military status receive a special qualification badge, known as the Astronaut Badge,
Chinese as a foreign language China. After this period, only Cantonese and Mandarin remained as the most influential variants of Chinese, the former due to the importance of maritime trade in Guangzhou and the emergence of Hong Kong as a key economy in East Asia. Chinese departments in the West were largely centered on Cantonese due to British colonial rule over Hong Kong until the opening of communist-ruled China starting in the 1970s. The teaching of Chinese as a foreign language in the People's Republic of China started in 1950 at Tsinghua University, initially serving students from Eastern Europe. Starting with Bulgaria in 1952, China