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1·Focal length is the distance between optical centre and principal focus.

焦距就是镜片中心和焦点之间的距离。

2·Focal length: The distance between the centre of a lens and its principal focus.

焦距：镜头中心与其主焦点的距离。

3·It's a major focus of the Bank's work, and it might well be the principal focus of the Bank 10 or 15 years from now.

清洁能源是世行工作的一项主要重点内容，而且很可能是今后10 - 15年中世行的一项首要重点内容。

4·Earthquake input pattern is a principal focus in the research on earthquake-resistance of engineering structures.

地震输入问题一直是工程结构抗震研究关注的焦点。

5·Why has poverty reduction, along with its health-related causes and consequences, become the principal focus of this commitment?

为何减贫工作及其与卫生有关的原因和后果成为这一承诺的主要焦点？

6·The principal focus of the program should be on the control of hazards and the reduction of risks, as opposed to merely satisfying regulations.

职业健康与安全（OHS）规程的目的就是预防职业伤害和疾病，它不仅需要满足法规的要求，更重要的是控制危害和减少风险。

7·The principal focus dealt with by the traditional market business is the so-called magic triangle which consists of enterprise, customer and competitor.

传统营销的研究焦点是由企业、顾客与竞争者构成的所谓的“魔术三角”。

8·New strategic partnerships to create more streamlined connections with key customers and with the Outdoor market are the principal focus for the sales team.

销售队伍的工作重点是，配合新战的略合作伙伴，创造更加有效的关键顾客和市场沟通。

9·By the Construction phase, with the technical risks effectively mitigated, the principal focus turns to the question Can we get all the work done by the end of the phase?

在构建阶段，技术风险大大降低，此时的主焦点问题是“我们在此阶段结束之前能够完成所有的必要任务吗？”

10·The principal focus of both projects is to equip the production facilities with powerful and reliable drives that will increase the productivity and availability of the rolling mills.

这两个项目的主焦点是为生产车间装备强大而可靠的驱动，提升轧钢厂的生产力和可用性。