A long cable allows the robot to move up and down while being tied to the rim of the volcano.

一根长电缆让机器人在被绑在火山边缘时上下移动。

Fluctuate v. move up and down

波动，变动

See their heads move up and down.

看到他们的头上下移动。

Skip, leap, or move up and down or sideways .

蹦，跳或上下左右地移动。

Our emotional lives move up and down constantly.

我们的情感生活总会上下变化。

The tiny-tiny little springs, that move up and down, okay.

这种非常极其细小的弹簧，可以上下运动。

This is actually a series of rafts. They move up and down on the waves.

事实上，它是随着海浪上下浮动的一组筏。

Effective Range: The range of motion used when the knees move up and down.

有效范围：膝盖上下移动的范围。

To control the porters to move up and down, push the box to the designated location.

要控制搬运工上下左右移动，来将箱子推到指定地点。

Well, how do you get this hearts to move up and down and seemingly in these random patterns?

但是，你怎样才能让这些爱心们看起来,像是在某种随机的模式下上上下下地移动呢？