Héng / zhèn / dòng / shì / zhǐ / zhèn / dòng / fāng / xiàng / yǔ / chuán / bō / fāng / xiàng / chuí / zhí / de / zhèn / dòng

横振动是指振动方向与传播方向垂直的振动。

Transverse vibration is vibration whose direction is perpendicular to the direction of propagation.