The first thing of note in Listing 13 and Listing 14 is that there are two condition variables instead of the one that the blocking queue had.
对于清单13和清单14，要注意的第一点是，这个阻塞队列有两个条件变量而不是一个。
Note that Listing 16 queries for the document by UUID, so check Listing 12 (or Listing 13) for your own UUID and use it in Listing 16.
注意，清单16按照UUID查询文档，因此检查清单12(或清单13)获取您自己的UUID，以便在清单16中使用它。
Editor's note: the MODIS image taken on March 13, after this image was published, provides a cloud-free view of the tsunami flooding in northeastern Japan.
编者按：在这幅图像发表后，拍摄于3月13日的MODIS图像提供了一副无云状态下日本东北部海啸洪灾的图片。
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