Studentengruppe. Fröhliche Schüler lachen während des zusätzlichen Unterrichts mit ihrem zufriedenen Lehrer in der Nähe - Stockfoto & -bild

Happy moments. Cheerful boy keeping smile on his face while laughing at joke with his friend

Funny kids. Pretty young ecology teacher sitting at the table and laughing together with her students while they cracking jokes after the class

Alternative energy. Cheerful delighted attractive woman sitting at the table and smiling while touching the windmill model

Work in group. Attractive woman keeping smile on her face and bowing head while leaning on table

Young talents. Energetic three colleagues designing windmills and working together

Do not touch it. Attractive brunette keeping smile on her face and leaning on table while listening her partners

Bearded handsome awesome male architect

Well done. Determined experienced ecologist working on the project and holding hands

Ready to work. Delighted nice team of professional engineers standing together and smiling while being ready to work

Look at this one. Nice positive beautiful woman sitting with her colleagues at the table and pointing at the windmill model while looking at it

How to save the energy. Nice handsome good looking men having a conversation and pointing at the windmill models while discussing environmental issues

Little samples. Delighted office workers looking at little windmills and expressing positivity while standing together

Sustainable energy. Nice positive handsome man thinking about the windmills design and doing the drawing while trying to help the environment

Environmental protection. Delighted female environmental engineer holding a table and using it while working in the office

Bustling office. The focus being on a wind power station model standing in the office where one man calculating proportions and another one negotiating on the phone