have used diamonds to polish theirstone axes(斧子) to mirror-like finishes, according to a new study... that's harder than corundum, Lu thought that the ancient Chinese must have used diamonds to shape and polish ……

人造宝石给我们带来的不仅仅是美丽。DO you know about gemstones (宝石) such as diamonds (钻石)? Their beauty always... a diamond-tipped drill to remove part of your tooth. Lab-made diamonds, however, are better than ……

Finding diamonds in the rough There was once a boy who was out playing in a field with his friends. As they were playing, the boy came across a stone that looked interesting. It wasn’t as dull (暗淡 ……

Stone created a PowerPoint presentation (陈述) to put her argument across.Stone, 25, is a rising star... movies. The latest one, The Amazing Spider-Man 2 (《超凡蜘蛛侠2》) will open on the Chinese mainland on May 4 ……

and drill for oil. Lab-made diamonds could also be used in high-tech devices (设备). They’re better.... Such diamonds could be used in devices that help blind people see and in radar equipment ……

and drill for oil. Lab-made diamonds could also be used in high-tech devices (设备). They’re better.... Such diamonds could be used in devices that help blind people see and in radar equipment ……

there is carbon on Mercury.Cannon used computers to model how many diamonds may have been made during 4.5... of diamonds may have been made on Mercury. That’s 16 times the amount on Earth. Cannon used computers ……

the following.Diamonds are 99.95 per cent pure crystallized carbon and can be 1 to 3 billion years old... straight to the heart).The "Four Cs" of diamonds are cut, colour, clarity and carat.Cut: Cut a diamond ……

heights of 2 to 9 meters. When they reach about 50 years of age, raffia trees flower and produce egg-size fruits. Several products come from these palms, including floor and shoe polish (鞋油). Raffia leaves ……

of the Nanjing Yuhua Stone Cultural Exchange Association, started observing stones at the age of 23... Chinese people collected them and appreciated the pattern of each stone. The most popular ……

二氧化碳制成的空气钻石。二氧化碳制成的空气钻石。A British environmentalist has developed the world’s only diamonds to be made from carbon and water.Dale Vince said he used environmentally friendly methods to make ……

Vince’s “green” diamonds. ICVince’s “green” diamonds. ICSky diamondsSky diamonds空气也能做钻石？空气也能做钻石？These diamonds (钻石) were “made from the sky”. Dale ……

's environment, and to "civilize" the people President Festus Mogai has reportedly called "Stone-Age creatures... the diamonds beneath the sand. Diamonds account for 1/3 of Botswana's GDP, and 70 per cent of export ……

are not rare but high-quality diamonds that can be used in jewelry are. Most diamonds that are 5. _______ (find) are not even a passable size and quality, and are used for industrial purposes. Diamonds ……

wait to sell his farm and go prospecting (寻找) for diamonds himself.So, he sold the farm and spent... gleaming at the bottom of the stream.2 He picked it up. It was a sparkling stone – a good-sized stone ……