柴油发动机是当今已知效率最高的原动机。

Forests are not just resources; they are our planet's lungs and our best defense against climate change.

I don't think that everyone should become a mathematician, but I do believe that many students don't give mathematics a real chance.

Quality is not a department; it is a responsibility of everyone in the organization.

Treating a person to a meal never fails， and is so easy to do. It’s powerful with old friends and a great way to make new friends.

更改规格以适合程序要容易得多，反之亦然。

世界上最成功的社会是那些能够将强大的国家与法治和民主问责制结合起来的社会。