these problems complex
这些问题很复杂
以上为机器翻译结果，长、整句建议使用 人工翻译 。
These complex problems require comprehensive solutions--solutions that, as Packard so presciently noted, go far beyond writing checks and donating products.
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They have recognized that these complex problems will never be solved unless there are more people creating change in the world.
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These are complex problems with costly solutions.
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