1, separated in space or time.

2. The length of space or time.

3, refers to the gap between understanding and feelings.

4. Distance is a scalar, with no direction, only content. This quantity will not be negative.

5. Mathematically, distance is a function defined in metric space.

Make sentences with distance:

1, Miss, is a well-kept homing pigeon. No matter how long it takes, it can always fly back to its original place.

2. The observer's error in determining the time when the vehicle passes through the known distance can be eliminated by using the humanoid car mirror.

3. The GIS scientist added: "The purpose of distance attenuation and island biogeography theory development is to understand the distribution of species, not the movement of individuals." .