In the past people didn't know that light travels faster than sound.

过去人们不知道光比声音传播得快。

youdao

Light travels faster than sound.

光比声音传播得快。

youdao

Some planes can fly even faster than sound.

有些飞机能够飞的比声音还快。

youdao

In the memorial, there is the X-1, the first airplane to fly faster than sound.

VOA: special.2010.07.07

The first plane ever to fly faster than the speed of sound was the X-1 in nineteen forty-seven.

VOA: special.2010.07.07

There are only minutes - sometimes seconds - to react, and the incoming weapons are traveling faster than the speed of sound.

VOA: standard.2010.03.26

Austrian Felix Baumgartner became the first skydiver to go faster than the speed of sound.

BBC: Your highlights of 2012 in drawings

If tests go as planned, it will be the first plane ever to fly faster than the speed of sound on a fuel mix that is half biomass.

WHITEHOUSE: Energy Security and Independence

Just last week, our Air Force -- our own Air Force -- used an advanced biofuel blend to fly a Raptor 22 -- an F-22 Raptor faster than the speed of sound.

WHITEHOUSE: America��s Energy Security