A mother and baby camel are talking one day when the baby camel asks，“Mom why have I got these huge three toed feet？”The mother replies，“Well son，when we trek across the desert your toes will help you to stay on top of the soft sand”，“OK”says the son。A few minutes later the son asks，“Mom，why have I got these great long eyelashes？”
They are to keep the sand out of your eyes on the trips through the desert，“Thanks Mom”replies the son。After a short while，the son returns and asks，“Mom，why have I got these great big humps on my back？”
The mother，now a little impatient with the boy replies，“They are to help us store water for our long treks across the desert，so we can go without drinking for long periods。”
“That's great mom，so we have huge feet to stop us sinking，and long eyelashes to keep the sand from our eyes and these humps to store water。”But Mom，
“Yes son？”
“Why the heck are we in the San Diego Zoo？”
骆驼妈妈和小骆驼有一天聊天，小骆驼问：“妈妈，为什么我的大脚有三个脚趾头？”妈妈答道：“儿子，咱们穿越沙漠的时候，脚趾能帮咱们站在软软的沙子上。”“好吧，”儿子说。
几分钟过后，儿子又问道：“妈妈，为什么我的睫毛这么长？”“穿越沙漠的时候，长睫毛能防止沙子进入眼中。”“谢谢妈妈。”儿子说道。
过了一小会儿，儿子又回来问道：“妈妈，为什么我的身上有山峰？”
骆驼妈妈有点不耐烦了，答道：“驼峰是帮咱们在沙漠中跋涉储存水的，这样咱们就能很长时间不喝水了。”
“太好了，妈妈，咱们有大脚来防止咱们沉入沙中，有长睫毛防止沙子进入眼中，有驼峰来存水。可是，妈妈……”
“怎么了，儿子？”
“为什么咱们却在圣地亚哥动物园里？”
1.trek v。艰苦跋涉
I'd like to trek through the jungle，because I like exciting vacations。（我想徙步穿过热带丛林，因为我喜欢令人兴奋的假期。）
2.impatient adj。无耐心的，不耐烦的，无法忍受的
He was very impatient with students who could not follow him。（他对听不懂他讲课的学生很不耐心。）