The simple r-g assumption is one of the most important in debt dynamics: an r-g of greater than zero (when interest rates are greater than GDP growth) means that the debt stock increases over time.
简单的对（r-g）的假设是债务动态中最重要的部分之一。
Time spent in zero G changes the body: Astronauts come home with bone loss and weakness. But what happens in their heads?
失重会改变身体：宇航员回家时会有骨质流失和肌肉无力的感觉，但是他们的大脑里会发生什么呢？
A leak is indicated if usage does not drop to zero, at least for a period of time, during a given time interval (e. g., during a 24-hour period).
如果在给定时间间隔(例如在24小时的时段)内，至少一段时间用量未降至零，则指示有泄漏。
A leak is indicated if usage does not drop to zero, at least for a period of time, during a given time interval (e. g., during a 24-hour period).
如果在给定时间间隔(例如在24小时的时段)内，至少一段时间用量未降至零，则指示有泄漏。
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