The substantial investment required for developing a spoken language system in each specific task is a hamper to the widespread use of speech technology.

目前由于特定任务域语料的稀疏并且难以收集，这严重阻碍了对话系统的可移植性。

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This case provides a valuable example that is significant for Chinese substantial investment and development of new low-carbon and renewable energy infrastructure.

这对于中国正推行节约型社会、优化用能结构以及新农村建设具有现实意义。

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But the costs are not likely to drop without widespread deployment, and widespread deployment is not likely to occur without substantial investment in demonstration-scale projects.

但是如果不普及CPV技术，这些成本就不可能下降；而如果不投入大笔资金来打造示范级的CPV项目，那么就不可能普及CPV技术。

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By maintaining a substantial investment in basic research, we invest in ourselves and in our future.

FORBES: Back to Basics at the National Science Foundation

And Britain's Vodafone has recently made a substantial investment in Vodacom, a South African mobile operator.

ECONOMIST: Chasing the rainbow | The

There is hardly any substantial investment in agricultural productivity, social facilities, infrastructure, trade or development.

BBC: Viewpoint: South Sudan has not lived up to the hype