How to distinguish between "truck loading and unloading earthwork" and "truck loading and unloading earthwork"

How do you feel that your question is like a college entrance examination question? What's so strict about lawyers' paperwork?

The difference lies in "automobile transportation" and "automobile transportation loading and unloading", that is, the former is manual loading and unloading, and the automobile is only responsible for pulling and transporting. The latter is only responsible for loading, pulling and transporting cars, and then unloading and reversing themselves. You got it? Hope to adopt