Vân gỗ hình cái cây
Hiện tượng được các chuyên gia sinh học đánh giá là hiếm hoi nhất từ trước đến nay: trên từng thớ gỗ cây dẻ ngựa lâu đời, vết sâu bệnh tạo thành hình thù y chang một cây cổ thụ.
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