Lecture with formulas on the blackboard in front of studentsLecture with formulas on the blackboard in front of students
A stone path across the sea. castle on the mountainA stone path across the sea. Castle on the mountain
An island with flowers in the middle of a picturesque pondAn island with flowers in the middle of a picturesque pond
The nature of the mountain is a reflection of the blue sky in the waterThe nature of the mountain is a reflection of the blue sky in the water
Sunflower on the background of the sky and the roadSunflower on the background of the sky and the road
Drawing of a man and a girl ready to fight on the great wall of chinaDrawing of a man and a girl ready to fight on the Great Wall of China