head twist

It does so by directing the eyes to focus on stable visual targets as the head turns.

它这样做，靠的是在头部转动时，把眼睛注视在不动的视觉目标上。

Driven and supported from above, there is a four-bladed rotating head.

传动的支持部分匀在上部，有四个叶片的旋转头。

Internal Low and Performance Study of Three-Dimensional Turbulent Flow in High-head Francis Composite Runners

高水头混流复合式转轮内部流动及其性能研究

A nonmoving part of a machine or power tool that supports a revolving part, such as the spindle of a lathe.

头座机器或动力工具上用于安装旋转部件的不能移动的部分，如车床的转轴

Numerical simulation of internal flow in ultra-high head Francis runner with splitter blades

超高水头混流式长短叶片转轮内部流动数值模拟

top-drive hydraulic power head

顶部驱动液压动力头

universal ball float adapter

万能球形活动头转接器

drill(ing) head

钻头; 主轴头; 钻床床头箱; 钻削动力头;钻头头部, 钎头

A slight curving or circular movement in a stem, as of a twining plant, caused by irregular growth rates of different parts.

转头运动植物茎的轻微弯曲或扭转的生长,象双生树那样,由不同部分的不规则生长速度引起

radial bearing upper drive sub

上部径向轴承传动接头

radial bearing lower drive sub

下部径向轴承传动接头

projectile nose aerodynamic characteristics

弹丸头部空气动力学

The cervical muscles control the movements of the head.

颈肌控制着头部的动作。

The rotary carriage provides rotary and vertical motion to the drill string and bit.

转动滑架为钻柱和钻头提供转动和垂直移动。

the rotation of the top kept time with the music.

头部的旋转要与符合音乐的拍子。

Study on the Optimum Rotating Angle of Human Head and Corresponding Vision Field

关于人体头部最佳转角及视野的研究

neck pivot point (P point)

颈部转动中心点（P点）

All the pins were freed for movement.

全部销钉转动自由。