For three kinds of different soil layer construction, the characters of the platform values and the characteristic periods of ground surface acceleration response spectra were studied.

系统地研究了软夹层在底部、中部和顶部的三种土层结构的反应谱平台值和特征周期的主要特征。

youdao

It has also been clear that the source of piston knock noise is the impact between piston and cylinder sleeve by the vibration acceleration of the engine's body surface.

又通过发动机机体表面振动加速度，确定活塞敲击噪声产生的根源在于活塞与缸套的碰撞冲击。

youdao

"The plane appears to have hit the surface of the water in flying position with a strong vertical acceleration," he noted, adding that the plane's belly hit the water first.

他指出：飞机看上去是在飞行方向上带着很强的垂直加速度撞到水面上，另外是机身的腹部首先撞到水面。

youdao

When you're falling to the surface of the Earth, you are describing a problem of constant acceleration.

当你讨论下落问题时,你在描述一个加速度恒定的问题

耶鲁公开课 - 基础物理课程节选

Right. The most famous example is that when things fall near the surface of the Earth, they all have the same acceleration, and the acceleration that's common is called g, and that's 9.8 m/s^.

最有名的例子就是,当物体地球表面附近下落时,它们都拥有相同的加速度,这个普遍的加速度叫做g,大小为9.8m/s^

耶鲁公开课 - 基础物理课程节选