If you describe something or someone as valuable, you mean that they are very useful and helpful.
useful , helpful
Many of our teachers also have valuable academic links with Heidelberg University.
我们的许多教师也和海德堡大学保持着有益的学术联系。
The experience was very valuable.
这一经验很宝贵。
Valuable objects are objects that are worth a lot of money.
Just because a camera is old does not mean it is valuable.
古旧的相机不一定就值钱。