There exists on optimal value of magnetic focusing field and beam voltage, which can minimize the ion noise amplitude.

束电流与束电压确定，存在最佳的磁场使离子噪声幅度最小。

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In addition, auto-searching in focusing field is also developed, and successive approximation approach was adopted as a method of auto-searching in this focusing system.

此外文章还讨论了在可调焦范围内进行焦点自动搜索的方法，选用了逐次逼近法来进行本系统自动调焦的控制。

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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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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

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

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

There are so many people focused on pushing our children to live their lives without the privacy that we took for granted growing up, it is important to support the entrepreneurs that are focusing on leveling the playing field for parents.

FORBES: The Parenting Minefield That is Social Media