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蜈蚣真的有一百只腳嗎?
[ 2007-02-05 13:54 ]
特別推薦:屁為什么會臭?      為什么熱水滅火更有效?
         “起電”是怎么回事   貓沙是誰發(fā)明的?

人們常把蜈蚣叫做百足蟲,在英語中它的名字centipede就是“有100條腿”的意思。那么,蜈蚣真的有那么多條腿嗎?這可不一定哦!

Scientists, whether intentionally, or unintentionally, tripped us up when they named the centipede, one of the oldest creatures in existence.

Yes, centipede really does mean "100-footed," and yes, some centipedes actually do have 100 feet, but no, not all do. In fact, some centipedes have more than 100 feet, and some have as few as 30. Perhaps, mathematicians, not scientists, should have done the calculations, and should have named this member of the species "Myriapoda," Latin for 'many footed'. Yes, the millipede also belongs to this ancient species, but does it really have 1,000 feet, as its name implies? Doubtful.

The centipede emerges from eggs, laid in the open, with either a full set of legs, or with a starter set of seven pairs, and plays add-a-pair each time it sheds its skin, until it reaches maturity. These paired legs grow out of a segment of the centipede's flat, many jointed body, making them much easier to keep track of, and the centipede less likely to stumble as he forages for food by night. The sheer number of legs, however, may present a problem for the centipede by day, as it must safely tuck them in, when taking cover under rocks or rotting wood.

The 8 to 10 tropical varieties of centipede have little to fear in this regard, because this kind of centipede bears enough poison in its two claws to kill a small bird. The claws containing the poison, as with all other centipedes, are located, along with its two feelers, on the section next to the head.

(英語點津 Annabel 編輯)

 
 
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