Taking operation of product oil in Guangxi province as an example, we probed operation status of product oil direct sales and development trend, analyzed direct sales market expanding direction.

文章以广西地区成品油经营情况为例，探讨成品油直销经营现状及发展趋势，分析未来直销经营的市场开拓方向。

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The study direction and development trend of waste water network and mass exchange integrated network have been proposed as well.

并指出了废水网络和质量交换集成网络研究的方向和发展趋势。

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The current situation of plasticity forming technology is described, and its development trend is also introduced. The research direction is put forward.

叙述了塑性成形技术的现状，介绍了现代塑性成形技术的发展趋势，提出了当代塑性成形技术的研究方向。

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