Note that we pass this method two parameters: the value we want to replace (Scriptign) and the replacement text (Scripting). After we run this command $a will be equal to this

注意我们传递给这个方法两个参数：我们想要替换的值(Scriptign)及用来替换的文本(Scripting)。

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In this paper, some methods are introduced to value the forest products, such as hedonic method, travel cost, replacement cost and contingent valuation.

本文介绍了国际上对森林产出的几种评估方法，如：享乐法、旅游成本法、替代成本法和意愿型价值评估法。

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In addition to the return value, this method has two output parameters to supply additional information about the replacement operation.

除了返回值，此方法还有两个输出参数，它们可提供有关替换操作的其他信息。

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