Rangers armed with silicon putty check the sculpture for cracks every fall but were unable to chip away at the black and green lichen that was spreading across the surface.
Rangers armed with silicon putty check the sculpture for cracks every fall but were unable to chip away at the black and green lichen that was spreading across the surface.
每年秋天，公园管理员都会用硅腻子检查雕像的裂缝，却不能清除掉蔓延覆盖在总统面部的黑色和绿色苔藓。