Now, light is a transverse wave, meaning that the wave travels in one direction and oscillates back and forth in a direction that's perpendicular to the direction of travel.
现在，光是一种横波，这意味着波沿一个方向传播，并在垂直于传播方向的方向上来回振荡。
Transverse wave
原声例句
Crash Course Physics 速成课物理
Crash Course Physics 速成课物理
These electromagnetic waves are a type of transverse wave, which means both fields, electric and magnetic, act in directions that are perpendicular to the direction in which the wave is moving.
这些电磁波是一种横波，这意味着电场和磁场都在垂直于波移动方向的方向上运行。
中文百科
横波
横波是介质振动方向和波行进方向垂直的一种波。若此波沿着x轴移动，则介质的振动方向为与x轴垂直的方向上。举例来说绳波就是一种横波。水波在外表看起来具有横波的样子，但实际上水分子的振动并非单纯的与波前进的方向垂直或平行，因此并不适合讨论其为横波或纵波。
地震时产生的横波的传递速率小于纵波（纵波包括声波和某些地震引起的震波（P波），其特征为介质粒子移动方向和行进方向平行）。
英语百科
Transverse wave 横波
A transverse wave is a moving wave that consists of oscillations occurring perpendicular (or right angled) to the direction of energy transfer. If a transverse wave is moving in the positive x-direction, its oscillations are in up and down directions that lie in the y–z plane. Light is an example of a transverse wave. With regard to transverse waves in matter, the displacement of the medium is perpendicular to the direction of propagation of the wave. A ripple in a pond and a wave on a string are easily visualized as transverse waves.