用英语介绍骆驼的特点```紧急`````

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Camels are even-toed ungulates in the genus Camelus.The Dromedary or Arabian Camel has a single hump,and the Bactrian Camel has two humps.They are native to the dry and desert areas of Northern Africa and Asia,respectively,however a recent discovery of camel bones in the U.S.dated at around 10,000 years old in Phoenix,Arizona could expand this range.[1] The average life expectancy of a camel is 50 to 60 years.The term camel is also used more broadly to describe any of the six camel-like creatures in the family Camelidae:the two true camels,and the four South American camelids:Llama,Alpaca,Guanaco,and Vicuña.
The name camel es to English via the Greek κάμηλος (kámēlos) from the Hebrew gamal or Arabic Jamal.
Bactrian camels have two coats:the warm inner coat of down and a rough outer coat which is long and hairy.They shed their fiber in clumps consisting of both coats,which can be gathered and separated.They produce about 7 kg (15 lb) of fiber annually.The fiber structure is similar to cashmere wool.The down is usually 2 to 8 cm (1–3 inches) long.While camel down does not felt easily,it may be spun into a yarn for knitting.
A fully-grown adult camel stands 1.85m/6 feet at the shoulder and 2.15m/7 feet at the hump.Camels can run up to 40mph in short bursts,and sustain speeds of up to 25mph.
Humans first domesticated camels between 3,500–3,000 years ago.The Dromedary and the Bactrian Camel are both still used for milk (which is more nutritious than cow's milk[citation needed]),meat,and as beasts of burden—the Dromedary in western Asia,and the Bactrian Camel further to the north and east in central Asia.