阿加西为了研究，访问了欧洲北部和北美的许多地方，从斯堪的纳维亚的山脉和新英格兰走到美国中西部起伏的丘陵。
For his research, Agassiz visited many places in the northern parts of Europe and North America, from the mountains of Scandinavia and New England to the rolling hills of the American Midwest.
阿帕拉契的古老山脉被又深又窄的山谷切割得高低起伏，有些山谷还不比一个足球场宽。
The ancient mountains of Appalachia are corrugated with deep, narrow valleys, some of them no wider than a football field.
夏威夷起伏的山脉被茂密的丛林所覆盖，这使得实地考察或是人造卫星监测变得困难起来。
Hawaii's rugged mountains are covered with dense jungle, which makes them difficult to study in the field or by satellite.
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