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      First, we should stay away from snow-covered trees and billboards. They can fall and hurt
 people, causing serious harm. Second, wearing snow boots is a wise choice. You can avoid falling down
falling down with them. Third, we'd better not go out unless it's necessary. If we have to go out, 
we must be careful and pay attention to the ground. In some areas, there may be hidden holes
under the snow. Fourth, we should stay away from cars and buses on the road. On snowy days, 
it's harder for them to stop in time.