Two small pouches, placed in the bottom of a shoe, are filled with the fluid and generate a current whenever they are compressed by the foot’s up and down motion.

当他们将两个装有该流体的小袋子置于鞋内时，它们就会因人脚抬升和下落的动作而受到挤压，从而产生电流。

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A group of students from MIT also recently announced the development of a shock absorber for vehicles that USES the up and down motion when driving to generate electricity.

另外一群MIT的研究者们最近也开发了一种车用脉冲吸收器，它可以利用汽车运行过程中的上下振动来产生电能。

youdao

If I see you through the glass, the object is going on some trajectory, which has got both up and down and horizontal motion.

如果我透过窗户看你，物体在一些轨道上，有上升和下降，也有水平运动。

youdao

The pistons go up and down as a person stands on lever devices treadles and uses a natural walking motion.

VOA: special.2009.08.17

But if I see you through the glass, the object is going on some trajectory, which has got both up and down and horizontal motion.

但是如果我透过窗户看到你,这个物体沿着某个轨迹运动,既有上下,也有水平方向的运动

耶鲁公开课 - 基础物理课程节选

Photos of shows from April 2011 show him "repeatedly moving his arms in a punching motion" and "violently flailing his arm in an up-and-down motion, " a criminal complaint says.

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As the fins tap the energy generated by the up-and-down motion of ocean waves, they move to propel the robot at speeds of up to 2 knots.

FORBES: Ocean Robot Completes Record-Setting 10,000 Mile Journey

Ms. Wachtel did a little demonstrating, which included her shaking technique an energetic two-shakes up and two-shakes down motion.

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