When a fuel unites with oxygen, we say the fuel burns; what is really happening is that chemical energy (fuel and oxygen) is changing to heat energy.

当燃料与氧气结合，我们就说燃料开始燃烧了，实际发生的是化学能(燃料与氧气)转化成热能。

youdao

Your industry is constantly changing and you need to keep up with what's happening now, Teach says.

你所在行业不停地发生变化，你需要时时刻刻紧跟这些变化，蒂奇说。

youdao

I like reading it for several reasons. First, from this newspaper I can get the latest news happening in China and around the world to keep pace with this fast changing world.

我特别喜欢读它，理由如下：首先，从这份报纸中我能获取最近的国内外新闻，我能与时代保持同步，不会落伍。

youdao

So, my advice is to continue to stay in touch with what is happening because this is a story that is constantly changing, with every day bringing new diplomatic, military and economic developments.

CNN: Kelly Wallace is a CNN White House correspondent.

"I think what's been happening in music within the last few years and with it changing so drastically, I think that everyone has had to expand their horizons, " she said.

CNN: STORY HIGHLIGHTS