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tree of knowledge. school learning ecology. teacher woman in glasses at biology lesson. school nature study. environmental education. happy student girl with plant at blackboard. copy space
Keywords:
education
leaf
plant
adult
green color
women
indoors
caucasian ethnicity
blackboard
nature
smiling
happiness
young adult
cheerful
portrait
one person
teacher of biology
environmental education
knowledge lesson
knowledge tree
tree of knowledge
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