Cách sử dụng
Gravel is a small rock that is usually found on the ground. It is often used to make pathways or driveways because it is easy to walk or drive on. Gravel is also used in construction, especially for making concrete. When you go outside, you might see gravel on a sidewalk or in a garden. And if someone says they need to "gravel a driveway," it means they need to put gravel on it so it is easier to drive on.