焦距：镜头中心与其主焦点的距离。
Focal length: The distance between the centre of a lens and its principal focus.
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。
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.
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？”
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？”
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?"
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