Unit vectors are always pointing in the direction of the positive axis x in the x direction is this one.

单位矢量,始终指向,轴的正方向,轴方向的单位矢量，and，the，unit，vector,是这个。

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Digital X-ray system for Testing wheels is composed of high frequency X-ray unit, X-ray image intensifier, the special mechanical device, computer image processing system, controller and lead cabinet.

轮毂X射线检测系统由高频X射线机、X射线图像增强器、轮毂检测专用机械装置，计算机图像处理系统、控制装置和铅防护房组成。

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i and j are unit vectors in the x and y directions.

和 j 分别是 x 和 y 方向上的单位矢量

耶鲁公开课 - 基础物理课程节选

Unit vector i points away from the origin in the x direction.

单位矢量 i 从原点指向 x 轴正方向

耶鲁公开课 - 基础物理课程节选

Facilities include 30 in-patient beds, a midwifery-led maternity unit, a minor injury unit and X-ray and space for mobile scanners.

BBC: Bridgwater Community Hospital, built in 1813

Furthermore, the unit's 900MHz x 2 high-performance dual-core chipset boosts the unit's image processing capacity so consumers can enjoy the highest picture quality and the fastest web-browsing speed.

ENGADGET: Samsung introduces its CES audio hardware, claims a world first

At Llanidloes, the LHB plans to cut 18 beds, close an X-ray unit, a birthing centre and outpatient services.

BBC: NEWS | UK | Wales | Mid Wales | Town fights hospital service cuts