For this reason, the speed of a grinding wheel should not exceed the safe surface speed limit specified by the manufacturer.

基于此原因，砂轮的速度不应超过制造商规定的安全表面速度的限制。

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Jean Romagnoli, sports medic and personal trainer working to get the miners in shape for their rescue, said the Phoenix capsule would be hoisted to the surface at a speed of about 60 kilometers per hour and would exert about 2 Gs of pressure on the miners.

CNN: STORY HIGHLIGHTS

Also included in the gaming suite is a dual-sided Razer Vespula mouse mat, with one side representing the Autobots with a speed-enhancing surface, the other of the Decepticons with a control-enhancing surface, to showcase your favored allegiance as you annihilate opponents with your preferred style of swiping.

ENGADGET: Razer trots out Transformers 3 Edition DeathAdder, Vespula and laptop case

If future testing goes well and "if my wife allows, " Mr. Branson joked, he and his two children plan to be among the first six voyagers to ride the maiden flight of SpaceShipTwo to the edge of space, or about 60 miles above the Earth's surface, at a maximum speed of about 2, 500 miles per hour.

WSJ: Virgin Galactic Spacecraft Tests Its Rockets in Flight