这种债券当前定价为$900。
这些史前定居点周围环境变化的一个关键指标是当地曾使用的木材。
One key indicator of change in the environment surrounding these prehistoric settlements is the wood that was used there.
人类最早在4500年前定居在北极，靠捕捞海洋哺乳动物和鱼类生存。
Humans first settled in the Arctic a mere 4,500 years ago, surviving by exploiting sea mammals and fish.
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