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.
有一次我确实不得不爬树，因为我在一条狭窄的小路上遇到了两只反复无常老野牛。
Once I did have to climb a tree, when I met two crotchety old bulls along a narrow track.
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