BBC2 年
How to calculate speed, distance and time
This makes it easier to read the measurements. For example, the speed a cricket ball travels might be measured in metres per second (m/s), while a car's speed might be measured in miles per hour ...
wam.ae1 天
Chinese researchers unveil world's fastest quadrupedal robot
In November 1976, the United Arab Emirates was on a date with the birth of the Emirates News Agency, as a news and knowledge ...