阅读理解：This week Xingliang Zhang
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This week Xingliang Zhang of Northwest University in China reports in Science the discovery of a new site full of soft-bodied animals that have never been seen before.
For soft-bodied animals to be preserved, something disastrous must take place. In the case of the world's two most famous Cambrian（寒武纪）sites, the Burgess Shale accumulation in Canada and the Chengjiang site, this disaster was a series of storms that dunked vast quantities of mud upon a community of animals, burying them alive.
The new site that Dr Zhang is reporting, known as Qingjiang, is similar to the others in that the animals seem to have been killed by a sudden mud burial. However, that is where the similarities end.
Qingjiang has produced over 20, 000 specimens（样本）thus far. Of these, 4, 351 have been properly analysed and are thought to represent around 100 groups of creatures. Dr Zhang and his colleagues estimate that 54 of these groups have never been seen before.
