The research on multi-dimensional conservation laws is one of the most challenging direction in the field of nonlinear partial differential equation, it is very important and very difficult.

高维守恒律方程的研究是非线性偏微分方程的最具有挑战性的方向之一。

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Its conservation law encompasses both its magnitude and its direction.

它的守恒定律包括大小和方向两方面。

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According to pyrology test, this article has analyzed energy conservation direction and step of electrode graphitization stove.

通过热工测试，分析了电极石墨化炉的节能方向与步骤。

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The report is intended to act as a wake-up call, but it's also sparked a debate over the direction of conservation strategy.

BBC: Stark warning over the state of nature

Steve Galster's comment about "studying the world to death" certainly communicated this concern, the future of conservation in many cases should focus on law enforcement, local initiatives and strong action, and conservation funding should reflect this direction.

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Ms. Wong expanded her alliances with farmers and conservation groups, heading out in a circle that now extends two hours in every direction from her house.

WSJ: Tama Matsuoka Wong, a Gourmet Harvester in the Wilds of New Jersey | Creating