Two men, wearing hard hats and blue and yellow coats stand in front of a large machine and smile.
The two men are wearing hard hats.
"The two men are wearing hard hats" is a generalization of "two men, wearing hard hats and blue and yellow coats stand in front of a large machine and smile" since it doesn't specify that they are standing in front of machinery or is smiling.
(-x)
(-x)