Some methods already exist, for example wind power.
有些方法已经存在，例如风力发电。
Many emerging methods exist, some of which already made their marks, while the others have not.
许多新出现的方法已经存在，它们中的一些已经投入了使用，另外一些则没有。
Many emerging methods exist, some of which already made their marks, while the others have not.
许多新出现的方法已经存在，它们中的一些已经投入了使用，另外一些则没有。
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