理想情况下，在一次反复结束前，客户将写好这次反复中素材的客户测试。
Ideally, customers will have the customer tests for the stories in an iteration written before that iteration is over.
这种方法改善了XSLT的性能，因为每个样式表只要解析和编译一次，就可以在以后的转换中反复使用。
This approach greatly improves the XSLT performance, since each stylesheet is parsed and compiled only once and reused for each subsequent transformation.
重度抑郁发作可能在个体一生中仅出现一次，但是更多的情况是重度抑郁在一生中反复发作。
Some people may experience only a single episode within their lifetime, but more often a person may have multiple episodes.
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