此外，大多数物种并不完全依赖单一的资源，如果一个物种的主要资源变得稀缺，该物种通常可以转向替代资源。

Furthermore, most species do not depend entirely on a single resource, if the major resource for a species becomes scarce, the species can usually shift to alternative resources.

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然而，几乎毫无疑问，大多数地区的沙漠化主要是由于人类活动而不是自然过程造成的。

There is little doubt, however, that desertification in most areas results primarily from human activities rather than natural processes.

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大多数学生上大学主要是为了获得他们所选择的职业所需的知识。

Most students attend a university mainly to acquire the knowledge needed for their chosen profession.

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