The talks taking place this week in Barcelona will be the last before a major U.N.summit in December where delegates will hash out a new deal to replace the Kyoto Protocol.

VOA: standard.2009.11.04

How do I rea-- replace the expression FOR t of n minus 1? Substitute it in again.

我们怎么来代替t这个表达式呢？,再来替换掉它，t等于。

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