The brief picture of this process is that: when a certain amount of benzo[a]pyrenes are absorbed into our body, they will first be converted into benzo[a]pyrene-7,8-epoxide by the works of a series of enzymes, and then to a benzo[a]pyrene-7,8-dihydrodiol, and ultimately to a ben...
With the World Environment Day coming,our school is now requiring every student to form a habit of sorting (分类) the waste.Here in our schoolyard we lay four different colors of rubbish bins for different kinds of rubbish.The red is for harmful waste;the blue is for waste that can be ...
As you know, it’s believed that Saturn, and all the planets in our solar system coalesced from a swirling cloud of gas some 4.8 billion years ago. However, if the rings are made of leftovers from that process, then they'd also be about 4.8 billion years old. The problem is that ...
我们人类的历史Here are the origins of our story,从这里开始书写us, mankind.人类历史起源于一群活化石It begins here, with a colony of living fossils,这是生活在海面叫做叠层石的细菌bacteria who live at the surface of the ocean, called stromatolites.我是它们的后代I am a descendant of this form ...
学练优九年级英语(JJ) 教学课件 Unit 5 Look into Science Lesson 27 5 学习目标 objectives To master the words and expressions: solar, telescope, certainly, unless, double, mystery; solar system, at night, even if; It’s worth a try, even if I don’t find a planet. To lea...
It is one of the largest known dwarf planets in our Solar System. The size of Eris (2326 km diameter) is approximately the same as the dwarf planet Pluto (2372 km diameter) but positioned three times farther from the Sun. The orbital length is too long and completes one orbit in 557 ...
Our world will then be sent into a safer, colder part of the solar system.This idea for improving our climate comes from a group of US National Aeronautics and Space Administration(NASA)engineers and American astronomers. They say their plan could add another six billion years to the useful ...
Scientists have found an unusual way to prevent our planet from overheating: move it to a cooler spot. All you have to do is send a few comets(彗星) in the direction of Earth, and its orbit will be changed. Our world will then be sent into a safer, colder part of the solar system...
Scientists have found an unusual way to prevent our planet from overheating: move it to a cooler spot. All you have to do is send a few comets(彗星) in the direction of Earth, and its orbit will be changed. Our world will then be sent into a safer, colder part of the solar system...
For decades, ambitious engineers and scientists around the world have been sending brave humans and robotic emissaries deep into our solar system to see what they could find. They've learned a lot, with 2016 marking major milestones in space exploration. The Cassini spacecraft has revealed previo...