The average citizen in the developed world usesover 155kg of paper per year.
发达国家中普通公民每年的用纸量超过155公斤。
《牛津词典》
2
This occurs because during NREM sleep the automatic, metabolic system has exclusive control over breathing and the body uses less oxygen and produces less carbon dioxide.
All existing supplies of helium ought to be conserved and released only by permit, with medical uses receiving precedence over other commercial or recreational demands.