每次出现处理文档的一个修改。

Each occurrence handles one modification to the document.

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这导致每次出现Symbol元素时该阶段都生成一个输出记录。

This causes the stage to produce an output record for each occurrence of the Symbol element.

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回顾全球历史，每次出现这样的贷款浪潮，之后就会出现银行危机。

Every time there has been a lending surge of this dimension, a banking crisis has followed.

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Every time a product shows up it's bought and paid for, for the most part.

产品的每次出现都需要支付费用,在大多数情况下都是这样

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