Based on a large amount of investigating data, the authors use cluster analysis method with ordered samples to set dividing standards for the growth rate of secondary forests rechange.

依据大量的调查资料，应用有序样本聚类方法，按林分类型、立地条件和林龄来确定次生林改造生长量划分标准；

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Cardiff council ordered more than 200 samples to be independently tested, which all came back negative.

BBC: Horsemeat scandal: Cardiff schools and care homes clear

Only last week an emergency vaccination programme was ordered in Cairo after samples of the polio virus were found in sewage - the strain matches that in southern Pakistan.

BBC: Bill Gates: The world can defeat polio

No horsemeat or pig DNA has been found in food samples taken from schools and care homes in Cardiff after tests were ordered by the council.

BBC: Horsemeat scandal: Cardiff schools and care homes clear