Controlling chaos is a new research field focusing on the application of nonlinear science.

混沌控制是非线性科学应用的新研究领域。

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Proper focusing is critical at night because small apertures are often impractical — therefore one cannot afford to waste mispositioning the depth of field (see hyperfocal distance).

在夜晚，合适的聚焦非常关键，因为小光圈常常不合实际。 因此，你不能错误地定位景深 （超焦距）。

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In this article, I shall introduce the field and the significant developments in knowledge management for learning and instruction, focusing on metadata for learning objects.

在本文中，我将介绍这个领域以及学习与教育知识管理的重大进展，重点放在学习对象的元数据上。

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So there is more even playing field instead of the 21:1 ratio, we are doing much more, focusing on the positive.

比起21比1的比率，两方更均衡，我们做得更多，除了专注于积极的一面。

哈佛公开课 - 幸福课课程节选

Second reason for having positive psychology's field of study and focusing on what works and focusing on research in happiness,relationships and wellbeing is because happiness does not spontaneously rise when take unhappiness away.

第二个研究积极心理学的原因,研究可行的事和,研究快乐，人际关系，幸福的原因,是因为幸福不会因为驱除了忧愁,而自动增长。

哈佛公开课 - 幸福课课程节选

And coupled with a 35MM lens adapter (not included), shooters can use cinema lenses to add shallow depth of field and better focusing for a DSLR-like feel.

ENGADGET: Padcaster SLR lens mount for iPad now available: priced at $149 or $189 for Lenscaster combo

The Rockefeller Foundation set out on this path at the very beginning, by focusing on field and capacity building to ensure the quality of the first few social impact bonds, engaging the capital markets and traditional investors, and as investors ourselves.

FORBES: Social Innovation in Acceleration: Building the Social Impact Bond Ecosystem

Other research projects in the field of artificial retinas are currently focusing on carbon-based materials like nanocrystalline diamond and graphene, but those are intended for replacing silicon electrodes, like the Argus 2.

FORBES: Artificial Retina From A Photovoltaic Polymer