What are some of the practical limitations to using biogas as an energy source on a large scale?

什么是一些实际的限制使用沼气作为能源的大规模？

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The SGML method of declaring reusable external entities is available for XML users, but this has several practical limitations in XML.

XML 用户也能使用声明可重用外部实体的 SGML 方法，但是 XML 中这种方法有一些实际的限制。

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Conflicting priorities might involve practical limitations, risk avoidance, or possibly differences in requirements among various business groups.

优先级的冲突可能会带来实践限制、风险规避或可能导致在各个不同业务组之间需求不同。

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We are therefore sending a message to all stakeholders to take a second look at this, and work together on the practical limitations in order to achieve an optimal, but not perfect, implementation of the concept.

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But there are practical limitations, he added.

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We've already spent some time interacting with the company's new depth-camera and eye-tracking technology, but now we wanted to dig deep to understand the thinking behind the system and what technical and practical limitations that need to be addressed before we can get to the computing future of Star Trek.

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