SSS 2008-09-22
时间：2018-12-24 作者：英语课 分类：Scientific American(九)月
This is Scientific American's 60-Second Science. I'm Karen Hopkin. This will just take a minute.
Fingers are pretty nifty. They let you to grab a latte, type on a keyboard, even pull up your pants. But did you ever wonder: where do fingers come from? In the 1990s, scientists gave this problem a lot of thought. And they concluded that fingers were pretty much invented by the first tetrapods: that is, critters with four limbs. One reason they thought that is because a fossilized skeleton of an ancient fish didn’t appear to have any fingers. Or at least any distinct digits 2 in its pectoral fin 1. But tetrapods, which evolved from fish, did.
Now scientists writing in the September 21st online issue of Nature say that that thinking was…a little fishy 3. Because they’ve unearthed 4 evidence that suggests that that ancient fish did indeed have fingers in its fins 5. The researchers did a CT scan on a specimen 6 about 380 million years old. And they found that the fish’s right fin, which was unusually well-preserved, does appear to have digitlike bones. The reason other researchers previously 7 missed them, they think, is because in their samples the fingers were hidden behind marks left by the fish’s scales. So fish, too, seem to have incipient 8 fingers. A finding we give two thumbs up.
Thanks for the minute for Scientific American's 60-Second Science. I'm Karen Hopkin.
- They swim using a small fin on their back.它们用背上的小鳍游动。
- The aircraft has a long tail fin.那架飞机有一个长长的尾翼。
- The number 1000 contains four digits. 1000是四位数。 来自《简明英汉词典》
- The number 410 contains three digits. 数字 410 中包括三个数目字。 来自《现代英汉综合大词典》
- It all sounds very fishy to me.所有这些在我听起来都很可疑。
- There was definitely something fishy going on.肯定当时有可疑的事情在进行中。
- Many unearthed cultural relics are set forth in the exhibition hall. 展览馆里陈列着许多出土文物。
- Some utensils were in a state of decay when they were unearthed. 有些器皿在出土时已经残破。
- The level of TNF-α positively correlated with BMI,FPG,HbA1C,TG,FINS and IRI,but not with SBP and DBP. TNF-α水平与BMI、FPG、HbA1C、TG、FINS和IRI呈显著正相关，与SBP、DBP无相关。 来自互联网
- Fins are a feature specific to fish. 鱼鳍是鱼类特有的特征。 来自辞典例句
- You'll need tweezers to hold up the specimen.你要用镊子来夹这标本。
- This specimen is richly variegated in colour.这件标本上有很多颜色。
- The bicycle tyre blew out at a previously damaged point.自行车胎在以前损坏过的地方又爆开了。
- Let me digress for a moment and explain what had happened previously.让我岔开一会儿，解释原先发生了什么。