Sound is caused by vibrations. A vibration is a back and forth movement.
声音是由振动引起的。振动就是往复运动。
The back and forth movement of the image's colors guides our eyes and spirits to produce a flow. In Hong Ling's paintings, far-reaching visuals are not the factors that move people.
画面中色彩的前后运动，引导我们的眼睛和心灵产生流动，在洪凌的画里打动人的不是一种视觉的深远。
Generally, the reason for such seasonal back-and-forth movement is to seek resources that aren't available within a single area year-round.
一般来说，进行这种季节性往返迁移是为了寻找在一个地区无法全年获得的资源。
That back-and-forth movement also adjusts the muscles in your legs and belly.
那种前后运动也能调节你腿部和腹部的肌肉。
A Colombian who wants someone to approach him often signals with a hand movement in which all the fingers of one hand, cupped, point downward as they move rapidly back and forth.
一个哥伦比亚人想要别人靠近他时，他通常会用一个手势，一只手的所有手指都呈杯状，指向下方，同时快速地前后移动。
For Empson, there's a kind of a fluid and easy movement back and forth between what for hermeneutics are three very different phenomena: author, text, reader.
对Empson来说，在作者，文本，读者之间，诠释学里认为这是三种非常不同的现象：，在三者之间有一种流畅的反复的关联。
We witness an intimate embrace, a continuous movement back and forth between real and mediated events, between what happens in everyday life, in the virtual sphere, and in the media landscape.
我们目睹了真实事件和媒体支配事件之间，日常生活、虚拟世界和媒体风景中发生的事情之间的亲密接触、不停反复。
Their existence and movement in this moment is synchronized, even harmonious as the power shifts back and forth between the central arch they form together.
它们的位置、动作都经过精心设计，互动和谐，力量和招式在双方间流转，中间形成了一道拱门形状。
Consequently, the pivoting movement of the holding-down and knock-over sinker (5) is forced to follow the back-and-forth linear movement of the knitting needle (4).
因此，迫使退圈和脱圈沉降片的枢转运动随动织针（4）的前后线性运动。
This back-and-forth movement of the disc causes air in front of the receiver to move back and forth in the same way.
这种往返运动使听筒前的空气以同样的方式做往返运动。
This back-and-forth movement of the disc causes air in front of the receiver to move back and forth in the same way.
这种往返运动使听筒前的空气以同样的方式做往返运动。
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