549　precious和previous

① precious珍贵的，贵重的。

To me our friendship is a very precious thing. 对我来说，我们之间的友谊是非常可贵的。

He has lost precious working time. 他失去了宝贵的工作时间。

② previous以前的，先前的，先的。

Have you had any previous experience，or is this kind of work new to you？你先前有过这种经历吗，抑或这对你来说是新工作？