Lecture with formulas on the blackboard in front of studentsLecture with formulas on the blackboard in front of students
The flag of the russian federation is waving in the windThe flag of the Russian Federation is waving in the wind
Church on the background of blue sky and mountainsChurch on the background of blue sky and mountains
Sunset on the sea and the reflection of the sun in the waterSunset on the sea and the reflection of the sun in the water
A gray block of rock on the shore, against the background of a lilac skyA gray block of rock on the shore, against the background of a lilac sky
Golden field with wheat ears on the background of cloudsGolden field with wheat ears on the background of clouds