The challenge is how to ensure food without increasing animal numbers and having an impact on fragile lands and our resource bases.

如何在不增加动物数量、不影响脆弱的土地和我们的资源基础的情况下确保食物供应，这是一项挑战。

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Therein lies the real challenge in the coming decades: how to expand agricultural output massively without increasing by much the amount of land used.

此即是未来几十年面临的真正挑战：如何大规模地增加农产量却不增加太多已用土地的数量。

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The main challenge lies in increasing the availability of treatment in resource-limited countries.

对于资源有限的国家，主要挑战是提供更多的治疗机会。

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The public sector can also work together with corporations and NGOs to organize complementary networks of small and medium enterprises to take on the challenge of increasing the distribution of and demand for quality, affordable products and services to improve maternal and child health.

FORBES: Building a Thriving Marketplace for Life-Saving Commodities

Of course, more distributed generators contributing variable renewable energy to the grid means an increasing challenge to regulate the consistency of supply and demand.

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The company also faces the challenge of increasing revenue at the rate investors have come to expect.

WSJ: The Forbidden City of Terry Gou