SSS 2012-03-19
时间：2019-01-08 作者：英语课 分类：Scientific American(三)月
英语课
This is Scientific American 60 Second Science, I am Christopher Intagliata, got a minute.
Scientists discover new species all the time—on the order of 15,000 a year. One of the latest additions to the tree of life is a new type of leopard 1 frog. Which might sound unremarkable, except for where it was found: New York City.
But how does a frog go unnoticed in the Big Apple? Well even experts have a hard time telling this new species from its northern and southern cousins on looks alone. But the new guy has a different croak 2, which raised ecologists' suspicions. So they tracked down four leopard frog populations with the unique call—including one within view of the Statue of Liberty—and took DNA 3 samples.
As they suspected, the odd croakers weren't southern or northern leopard frogs, or even a mix. They had a genetic 4 ancestry 5 of their own—earning them new species status. Those results appear in the journal Molecular 6 Phylogenetics and Evolution.
The frogs are tough New Yorkers—the center of their range appears to be Yankee Stadium. But the researchers say that the urban amphibians 7 face threats like pesticides 8 and infectious diseases. Not to mention real-life games of Frogger.
n.豹
- I saw a man in a leopard skin yesterday.我昨天看见一个穿着豹皮的男人。
- The leopard's skin is marked with black spots.豹皮上有黑色斑点。
vi.嘎嘎叫，发牢骚
- Everyone seemed rather out of sorts and inclined to croak.每个人似乎都有点不对劲，想发发牢骚。
- Frogs began to croak with the rainfall.蛙随着雨落开始哇哇叫。
(缩)deoxyribonucleic acid 脱氧核糖核酸
- DNA is stored in the nucleus of a cell.脱氧核糖核酸储存于细胞的细胞核里。
- Gene mutations are alterations in the DNA code.基因突变是指DNA密码的改变。
adj.遗传的，遗传学的
- It's very difficult to treat genetic diseases.遗传性疾病治疗起来很困难。
- Each daughter cell can receive a full complement of the genetic information.每个子细胞可以收到遗传信息的一个完全补偿物。
n.祖先，家世
- Their ancestry settled the land in 1856.他们的祖辈1856年在这块土地上定居下来。
- He is an American of French ancestry.他是法国血统的美国人。
adj.分子的；克分子的
- The research will provide direct insight into molecular mechanisms.这项研究将使人能够直接地了解分子的机理。
- For the pressure to become zero, molecular bombardment must cease.当压强趋近于零时，分子的碰撞就停止了。
两栖动物( amphibian的名词复数 )； 水陆两用车； 水旱两生植物； 水陆两用飞行器
- The skin of amphibians is permeable to water. 两栖动物的皮肤是透水的。
- Two amphibians ferry them out over the sands. 两辆水陆两用车把他们渡过沙滩。
n.杀虫剂( pesticide的名词复数 )；除害药物
- vegetables grown without the use of pesticides 未用杀虫剂种植的蔬菜
- There is a lot of concern over the amount of herbicides and pesticides used in farming. 人们对农业上灭草剂和杀虫剂的用量非常担忧。 来自《简明英汉词典》