Lecture with formulas on the blackboard in front of studentsLecture with formulas on the blackboard in front of students
In the evening, the weather is cloudy on the field, the grasses and oats are soakedIn the evening, the weather is cloudy on the field, the grasses and oats are soaked
Blue river at the foot of green mountains, green trees on the right bank against the sky in white cloudsBlue river at the foot of green mountains, green trees on the right bank against the sky in white clouds
Hourglass on the background of the beach with the sea on the background of sunset wallpaperHourglass on the background of the beach with the sea on the background of sunset wallpaper