英语视频：神十航天员天宫开讲 中国首次太空授课成功

 　王亚平太空授课，演示水膜变水球

　　China's second female astronaut, Wang Yaping, has delivered the country's first-ever video lecture from space.

　　Speaking to students via live video, Ms Wang used spinning tops, a ball, water and a fellow astronaut to explain physics in zero-gravity.

　　She was speaking from the Tiangong-1 space laboratory, where the Shenzhou spacecraft is currently docked,

　　China's fifth manned space mission, Shenzhou-10, is scheduled to end around 25 or 26 June. The crew is also expected to attempt a manual docking later on Thursday.

　　This will involve getting back inside their Shenzhou capsule, unhooking from Tiangong and then flying around the lab to re-attach the capsule to the laboratory.

　　Ms Yang used difference experiments to demonstrate the concepts of weight and mass in space.

　　After showing how normal scales did not work in space, she used a special scale to measure the mass of crew commander Nie Haisheng, using Newton's second law of motion - measuring the mass of an object through force and acceleration¹.

　　At another point, to show how objects move in the microgravity environment of space, she asked her colleague to help her rotate 90 degrees, and then 180 degrees, from the floor of the laboratory.

　　Spinning tops were used to create gyroscopic motion in space, and a ball attached to a string to demonstrate pendulum² motion.

　　Towards the end of the class, Ms Yang made a film of water using a metal ring, explained by the increased surface tension of water in space. She then turned the film of water into a water ball by pouring more water onto it, to wide applause from students watching in China.

　　Around 330 primary and secondary school students watched the lecture from a special classroom in Beijing, where they could also ask Ms Wang questions through a live video feed, state media said.

　　In response to a student's question, Ms Yang described what she could see in space.

　　"The stars we see are much brighter, but they do not twinkle," she said, explaining this was due to the lack of Earth's obstructing³ atmosphere.

　　"The sky we see isn't blue, but black. And every day, we can see the sun rise 16 times because we circle the Earth every 90 minutes."

　　An estimated 60 million students and teachers around China were also expected to watch the lecture live, the Ministry⁴ of Education said.

1 acceleration   

n.加速，加速度

参考例句：

• All spacemen must be able to bear acceleration.所有太空人都应能承受加速度。
• He has also called for an acceleration of political reforms.他同时呼吁加快政治改革的步伐。

2 pendulum   

n.摆，钟摆

参考例句：

• The pendulum swung slowly to and fro.钟摆在慢慢地来回摆动。
• He accidentally found that the desk clock did not swing its pendulum.他无意中发现座钟不摇摆了。

3 obstructing   

阻塞( obstruct的现在分词 )； 堵塞； 阻碍； 阻止

参考例句：

• You can't park here, you're obstructing my driveway. 你不能在这里停车，你挡住了我家的车道。
• He was charged for obstructing the highway. 他因阻碍交通而受控告。

4 ministry   

n.(政府的)部；牧师

参考例句：

• They sent a deputation to the ministry to complain.他们派了一个代表团到部里投诉。
• We probed the Air Ministry statements.我们调查了空军部的记录。