您还需要统计数组中的元素个数，并将其保存在变量 $numstories中。
You also need to count the number of elements in the array and use a variable $numstories to contain the result.
count函数统计数组中的元素个数，所以在本例中 $elems应该等于3。
The count function counts the number of elements in an array, so you would expect $elems to equal 3 in the example.
根据世界贸易组织统计的平均国际贸易交易涉及：20—30个不同方，40个文件，200个数据元素(其中30个至少要重复30次以上)。
According to the World trade Organization the average international trade transaction involves: 20-30 different parties, 40 documents, 200 data elements (30 of which are repeated at least 30 times).
根据世界贸易组织统计的平均国际贸易交易涉及：20—30个不同方，40个文件，200个数据元素(其中30个至少要重复30次以上)。
According to the World trade Organization the average international trade transaction involves: 20-30 different parties, 40 documents, 200 data elements (30 of which are repeated at least 30 times).
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