17.The Welland Lakes contain many relics of human culture. Several radio’isotope/ˌreɪdiəʊˈaɪsətəʊp/(放射性同位素) dates indicate that humans have been exploiting the area for at least 30,000 years. Human activities in the lake are not limited to ancient times. Research data show that human beings lived here for a long time and left the earliest remains of modern human activities in the world. A 26,000-year-old cremation site (the earliest in the world) has been found here, along with archaeological discoveries of a 30,000-year-old ochreˈəʊkə(r)/(赭色的)burial site, remains of large marsupials and 18,000-year-old grindstones and stucco/ˈstʌkəʊ/(灰泥).
1969年，考古学家在这一地带发现了许多人类遗迹化石如：原始人使用过的简单工具。这些工具是用淡水贝类、石头和骨头制成的，而且被火烧过。经过多次考察，又发现了200多件尖端锐利的石器。这些石器是在1.8万年前制成的，原始人用它们播种和获取猎物。另外，考古学家还发现了大量的动物骨骼化石。
· 18.In 1969, archaeologists found many human remains in the area, such as simple tools used by primitive /ˈprɪmətɪv/(原始的、远古的) people. The tools were made of freshwater(淡水) shellfish(贝母), stone and bone, and had been burned. After many investigations, more than 200 stone tools with sharp tips were found. The stone tools were made 18,000 years ago, and primitive people used them to plant seeds and get prey. In addition, archaeologists have found a large number of fossil animal bones.
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