1817年，在第一次移民大潮中，一位英国游客观察到：“古老的美洲似乎正在分裂并向西移动。”
"Old America seemed to be breaking up and moving westward," observed an English visitor in 1817, during the first great wave of migration.
他们用摄像机从几英里外观察美洲虎。
They use video cameras to watch the jaguars from several miles away.
例如，根据新美洲基金会（一个智囊团）的Lisa Margonelli的观察，自1969年开始，尼日利亚每年都发生一次规模巨大的泄油事件。
Nigeria, for example, has had a major oil spill every year since 1969, observes Lisa Margonelli of the New America Foundation, a think-tank.
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