Simple when you know.....

A Russian guy is walking along the road. He sees two workmen on the grass verge, and stops to watch. One digs a hole, then the other fills it in while the first moves along a few yards and digs another. Intrigued, he watches them progress slowly along the verge. Unable to contain his curiosity, he crosses over and enquires what they are doing. "It's Dmitri" says the first."He's sick" says the second. "So Dmitri's sick?" asks the man, "What's that got to do...". The first man stops digging and looks at him as if talking to an idiot. "Dmitri brings the trees!"