Labor-saving devices are inventions that reduce the time and effort needed to perform or complete a task. Farm equipment, home appliances and construction equipment are examples of mechanical inventions that save time and physical labor.
<span>Both may occur when plates slide past each other.
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There has been a marked increase in virtual reality games since the military developed conflict-based simulators.
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What is the main idea of the passage? To save birds, communication towers have begun using blinking lights. Birds are attracted to the steady red lights on communication tower.
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