1) The posture, foliage, flower and fruit of Cydonia oblonga Mill have highly ornamental value, so it is a good stirp of decorative trees.

2) Therefore, Cydonia oblonga Mill has highly value to popularize in North China.

3) Explanation: The unusual stone mesas of the Cydonia region on Mars are quite striking in appearance.

4) Hoagland theorized that an alien civilization colonized Mars and that the face was evidence of an alien city in the Cydonia region.

5) When other satellites photographed the surface of Mars, the pictures of the Cydonia region revealed that the face was just an eroded mesa .