Now that's not gonna do anything on its own, but when it's given a puff of air, it expands and contracts and manages to inchworm itself to a slightly different place.

现在它本身不会做任何事情，但是当它被给予一股空气时，它会膨胀和收缩，并设法将自己蠕动到一个稍微不同的地方。