参考资料：
https://en.wikipedia.org/wiki/Camel
https://www.youtube.com/watch?v=9NC2saE5MbQ
http://sa.ylib.com/MagArticle.aspx?Unit=easylearn&id=1883
https://en.wikipedia.org/wiki/Camel
https://news.nationalgeographic.com/2018/05/camels-cactus-mouth-papillae-animals/
https://www.specialtyproduce.com/produce/Saltbush_15908.php https://www.soliton56.ru/chto-edyat-verblyudy-chto-est-verblyud-v-pustyne-i-v-zooparke.html https://animals.mom.me/food-camel-eat-3394.html
http://sa.ylib.com/MagArticle.aspx?Unit=easylearn&id=1883
https://www.ted.com/talks/keith_bellows_on_the_camel_s_hump#t-537876
https://animals.howstuffworks.com/mammals/camel-go-without-water1.htm
http://www.xinhuanet.com/science/2019-03/29/c_137933863.htm
https://cactusway.com/can-camels-eat-cactus-everything-you-need-to-know-about/
https://www.nationalgeographic.com/animals/article/camels-cactus-mouth-papillae-animals#:~:text=Their%20bodies%20are%20built%20for,pear%20cactus%20near%20Tucson%2C%20Arizona.
https://www.pbs.org/wnet/nature/blog/camel-fact-sheet/#:~:text=Camels%20are%20herbivores%2C%20eating%20grass,in%20their%20harsh%20desert%20environment.