un·sus·tain·able [ˌʌnsəˈsteɪnəbl̩] 形
1. unsustainable 不变的 (not maintainable):
- unsustainable levels
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2. unsustainable 不变的 ÖKOL (damaging to ecology):
- unsustainable
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3. unsustainable (not to be supported):
- unsustainable argument, remark
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单语范例（未经PONS编辑处理）
The situation became unsustainable and a civil war begun.
en.wikipedia.org Such rapid growth (due partially to speculation) was unsustainable, however.
en.wikipedia.org If every brother married separately and had children, family land would be split into unsustainable small plots.
en.wikipedia.org The decline in sheep prices meant that even the local stock (sold around the world for breeding for over two centuries) became unsustainable.
en.wikipedia.org Unsustainable hunting and destruction of vegetation, especially during summer, are considered threats.
en.wikipedia.org