Consider a space station where air must be manufactured at great cost: charging each breather per liter of air may be fair, but wearing the metered gas mask all day and all night is intolerable even if everyone can afford to pay the air bill.
Consider a space station where air must be manufactured at great cost: charging each breather per liter of air may be fair, but wearing the metered gas mask all day and all night is intolerable even if everyone can afford to pay the air bill.
设想在一个需要昂贵费用制造空气的太空站里：向呼吸者收取每升空气的费用是合理的，但是如果必须整日整夜地配戴计量呼吸量的面具，那将是无法忍受的，即使能够支付空气账单。