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The scientists used the Hubble to figure out the direction of the star's travels and the distance from the galactic center, along with the star's mass, age and speed.

科学家们利用哈勃望远镜计算出该恒星行进的方向和离银河系中心的距离，连同他的质量、年龄和速度一起计算。

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This particle is constantly changing its direction, but it therefore has an acceleration and the acceleration, we have shown here, is pointing towards the center.

这个质点恒定地改变它的运动方向,因此它具有加速度,而且这个加速度,我们前面也讲过了,指向圆心

耶鲁公开课 - 基础物理课程节选

It tells you when a particle moves in a circle, it has an acceleration in a negative R direction, namely directed towards the center.

它告诉你当一个物体在圆周上运动时,它有一个在 -R 方向的加速度,也就是说是直接指向圆心的

耶鲁公开课 - 基础物理课程节选

If you want to write it as a vector equation, you want to write it as v square over r minus-- I want to say that it's pointing in the direction toward the center.

如果要写出矢量方程,就应该写成 -v^2 / r,也就是说,方向就向圆心

耶鲁公开课 - 基础物理课程节选

As deputy director for science operations, Dr. Moscicki will share in executive direction of Center operations and provide leadership in overseeing the development, implementation, and direction of our programs.

FORBES: FDA Gets a New Regulator

With CDER now over 4, 000 employees, Dr. Moscicki, in his newly established role, will join Bob Temple, deputy director for clinical science, and Doug Throckmorton, deputy director for regulatory programs, in providing leadership and overall direction to Center activities to ensure that we accomplish our mission most effectively.

FORBES: FDA Gets a New Regulator

The general functions of the Center shall apply to all archival records, regardless of whether they have yet been accessioned into the National Archives, and all referral processing of accessioned records shall take place under the direction of the Center.

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