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Hard school work. Portrait of a stressed Hispanic teacher, tutor at the blackboard. Emotions are perplexed. Crazy student in class. College exam. Hard exam. Busy student life.
professional engineers in safety vests and hardhats working with blueprints and showing construction, Industrial engineers in hard hat discuss new project, they work in manufacturing factory.
Couple of old man and woman miniature standing with red pin and number sixty for time to retirement after hard working , currently aging society is global trend which effect to world economic growth.
Construction craftsman wearing hard hat, goggles, and overalls, carrying a toolbox at a building site
An Asian adult woman's hand is drawing a blueprint for a construction plan. This image depicts an architect hand at work designing house plans with a pencil and ruler. Look at the construction plan

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