On an average day, sound waves travel at about 762 miles per hour. So, option (d) is supersonic. That`s your answer and that`s your shoutout.

平均每天，声波的速度可达每小时约762英里。所以，选择(d)是超音速。这就是你的回答和你的shoutout。

AZUZ: Of course, jets can break the speed of sound, but can a car? One did in 1997 in Nevada`s Black Rock Desert. A British driver took a jet engine vehicle to 763 miles per hour, a Guinness World Record that still stands.

当然，飞机的速度可以突破超音速，但是汽车呢?1997年内华达州黑岩沙漠一辆汽车做到了。英国司机开了一辆喷气发动机汽车，车速达到763英里每小时，仍是现在的吉尼斯世界纪录。

It was supersonic and it`s kind of slow, at least when compared to what engineers hope what this will do. It`s called the Bloodhound Project, estimated cost, $62 million, paid for by sponsors and supporters.

这就是超音速，但是有点慢，至少相比，工程师希望能达到这样。这辆车叫做寻血猎犬，估计成本达到620万美元，由赞助者和支持者们出资。

Critics may say it`s a waste of money, but the project`s director says he hopes it will inspire Britain`s future engineers.

批评人士称这就是浪费钱，但是该项目的负责人称，他希望该项目能为未来英国发动机的发展提供灵感。

On an average day, sound waves travel at about 762 miles per hour. So, option (d) is supersonic. That`s your answer and that`s your shoutout.

AZUZ: Of course, jets can break the speed of sound, but can a car? One did in 1997 in Nevada`s Black Rock Desert. A British driver took a jet engine vehicle to 763 miles per hour, a Guinness World Record that still stands.

It was supersonic and it`s kind of slow, at least when compared to what engineers hope what this will do. It`s called the Bloodhound Project, estimated cost, $62 million, paid for by sponsors and supporters.

Critics may say it`s a waste of money, but the project`s director says he hopes it will inspire Britain`s future engineers.