Module 6　Unexplained Mysteries of the Natural World

　　在南太平洋上一个117 平方米的小岛充满了神秘色彩，众多巨石头像成了这里的未解之谜，科学家们一直在不断探索它们的出处。

　　The Mystery of Easter Island

　　One of the greatest mysteries on the Earth is the statues standing on Easter Island.Easter Island is one of the most remote islands on the Earth.It is in the southern Pacific Ocean，2，300 miles west of the coast of Chile and 2，500 miles southeast of Tahiti.

　　Who built these statues and why and how did they get there? Nobody knows the answer for sure，but many are trying to find it out.It has even been suggested that space aliens may have played a role regarding these giant statues.There are also other theories about it.

　　One theory suggests that Easter Island was inhabited by Polynesian sailors，who traveled thousands of miles in their canoes，guided by the stars，the color of sky and the sun，the shapes of clouds，the birds making flights out to sea seeking food.The Polynesians first arrived on the island in 400 A．D.However，the ocean currents which carried them there would not take them back.They were trapped and could not leave.

The Easter Islanders had their own system of writing，different from any other in