今天跟大家讲一种气体～
它能大能小，能升能隐；
大则如云似雾，
小则隐介藏形；
升则飞腾于人群之间，
隐则潜伏于菊花之内。
它就是——屁！
附件2:《参考资料》
[1] 张巧丽,杜军保,唐朝枢. 分子氢与氧化应激损伤——从惰性气体到医疗用气体[J]. 北京大学学报(医学版),2011,43(02):315-319.
[2] Miller TL; Wolin MJ; de Macario EC; Macario AJ (1982).
\"Isolation of Methanobrevibacter smithii from human faeces\". Applied and Environmental Microbiology. 43 (1): 227–32.
[3] Tomlin, J; Lowis, C; Read, NW (June 1991). \"Investigation of normal flatus production in healthy volunteers\". Gut. 32 (6): 665–669.
[4] Levitt, MD; Furne, J; Aeolus, MR; Suarez, FL (November 1998). \"Evaluation of an extremely flatulent patient: case report and proposed diagnostic and therapeutic approach\". The American Journal of Gastroenterology. 93 (11): 2276–2281.
[5] Pilcher,H.(2004).Flatulent fish net Ig Nobel award. Nature.
doi:10.1038/news040927-19
[6] Schwanke, Catherine (4 June 2009). \"Is It True That Birds Can't Fart?\". Popular Science. Archived from the original on 26 April 2016. Retrieved 18 June 2016.
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来源：局部气候调查组