通常由你参加的具体项目和时间长短决定，(如果是野生动物保护工程的花销要更高)。
It usually depends on the volunteering experience you want (conservation and wildlife projects are more expensive to run) and how long you're going for.
对引黄工程沿线的野生动物进行了调查，共有陆栖脊椎动物16目、31科、共计71种。
Wild animals along the Yellow River Diversion Project (YRDP) line have been investigated. There are wild animals including 16 orders, 31 families and 71 species.
由于这项野生动物保护工程，麋鹿的数量已经增加了。
Because of the wildlife project, the number of milu deer has increased.
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