China already possesses the world’s     1     (large) high-speed railway network, and it will only become more     2     (ambition), according to the country’s new Five-Year Plan. But it’s not just the railroads that are extending. China may also get a major boost     3     the speed of its bullet trains. A maglev train recently launched at Southwest Jiaotong University in Chengdu, Sichuan Province     4     (aim) to set a new speed record for trains. The current record of 603 kilometers per hour     5     (hold) by Japan’s SCMaglev. China's answer to it is 620.

This maglev train displays     6     is known as “high-temperature superconductive” technology, or HTS. It takes advantage of two unique     7     (property) of high-temperature superconductors: the “Meissner effect” which allows a superconductor to completely resist the magnetic fields around it, and “flux pinning(能量锁住),” which keeps the superconductor steady above     8     (it) magnetic tracks, so it never falls off.

Professor Jin Zhaohui, at the university’s Design Institute, said that they could push the train’s speed limit even further to possibly 1, 500 kilometers per hour in special tubes or tunnels. But for now,     9     key is to put its     10     (design) 620-kilometers-per-hour top speed to the test, and Jin and Deng have their teams working together to build a 40-kilometer-long test track outside Chengdu.

China has landed on the moon three times, and even managed     1    (bring) one of its robotic lunar explorers back to Earth. The country’s space agency     2    (complete) a key step toward landing on Mars on Wednesday when Tianwen-1, the spacecraft     3     (send) last July, began its orbit of the red planet, according to state media reports. By accomplishing this feat, China completed its first     4     (success) journey to another planet in our solar system.

The spacecraft was also the second to arrive at Mars in two days,     5     (follow) a United Arab Emirates probe that began orbiting the neighboring world on Tuesday.

China is expected to try to place a lander and a robotic rover on the planet later this year. It would join     6     could by then be a trio of NASA spacecraft studying the Martian surface.

Tianwen-1 left Earth last summer, taking advantage of a period     7     Mars and Earth were closest to each other during their journeys around the sun. That allowed a     8    (relative) short transit between the two worlds. The probe sent back pictures of the red planet     9     a distance of about 1.3 million miles.

But while the     10    (arrive) at Mars was a new milestone for China's space program, a bigger challenge for the Tianwen-1 mission is a few months away.

Researchers have completed an online map of the world’s coral reefs (珊瑚礁). The map, called the Allen Coral Atlas,     1     (think) highly of because it can act as a source of reference for reef conservation, ocean planning and coral science as researchers try to prevent the     2     (lose) of the fragile ecosystems seriously affected by climate change.

The group     3     (announce) the completion of the map earlier. They said the map is the first global, high-resolution (高清晰度的) map of its kind,     4     aim is to both document the evolving state of the world’s coral reefs and ensure that there’re measures taken     5     (protect) them as swiftly as possible. It gives users the ability to see detailed and     6     (accuracy) information about local reefs, and is meant to influence policy decisions about protected ocean areas, upcoming coral restoration projects, and so on.

The Allen Coral Atlas was     7     (true) a joint effort of scientists, technologists, and conservationists. The researchers received help from hundreds of field contributors     8     (give) them local information about reefs. In this way, they could program their satellites and software to focus their attention     9     the right areas. And that let them bring the playing field up to a level where they could take a larger area into consideration to make decisions     10     ever.

The world’s first 3D restaurant, FOOD INK,     1     (provide) an entirely 3D printed dining experience. Its goal is     2     (raise) awareness about 3D-printing technology. It is a place     3     everything comes out of printers, from the food     4     the plates.

Various foods,     5     (include) pork, chicken, and peas, are printed out. 3D printing not just makes food     6     (visual) attractive, but has other benefits. With a growing population, some experts believe printers could     7     (use) to replace the ingredients of many dishes, so it may contribute to the     8     (solve) to the world hunger problem. It could provide nutritious food for those in areas     9     (affect) by natural disasters. The innovation has made     10     possible to produce a mass of food.