a learned skill的用法和样例：
- Fortunately, it's a learnable skill.
- Making money is a learnable skill.
- It would be a learned skill, like walking, jumping, singing, reading, and balancing a checkbook.
- It is a lovely way to perceive the world, and it is a learnable skill.
- A learned man is an idler who kills time by study.
- He was a learned and accomplished worthy.