a nuts-and-bolts person的用法和样例：
- These nuts and bolts hold the wheels on.
- He can drive a car but he doesn't know anything about the nuts and bolts of the engine.
- He doesn't know the nuts and bolts of our accounting system.
- You have to study the nuts and bolts of English grammar.
- First learn the nuts and bolts of cooking; then you can try your own ideas.
- He carefully cracked a nut and then give it to me.