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.

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。

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At home and abroad, physical attractiveness has been considered a major resource.

在国内外，相貌已经被认为是一项重要的资源。

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A child must also learn that a major resource for a healthy self-esteem comes from within.

小孩也必须认识到健康的自尊心的一个重要来说是内心。

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William Bach, a State Department counter-narcotics official, said drug trafficking "just doesn't seem to be the major resource for al-Qaeda".

BBC: refugees fleeing Afghanistan

We want to provide the tools to mine big data, as that is unquestionably the major resource of this century.

FORBES: What Do Former CIA Spies Do When They Quit the Spy Game?

They become the major resource of effectiveness to try and fight this battle offshore, and we know what we're doing near the wellhead.

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