他算出他的债务总数。
当我们算出了在各个恒星中锂原子的总数，同位素锂- 7的总量仅是在那里应有量的三分之一。
When we count up the lithium atoms held in stars, there is only one-third as much of the lithium-7 isotope as there should be.
除非你碰到一些大的花销，否则的话，这个总数应该比上周工作的时间要少(也就是这周开始时候计算出来的工作时间)。
Unless you have some major spending problems, this total should be less than your total hours you spend working in a given week (which you figured up earlier in the week).
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