zhè / zhāng / tú / xiǎn / shì / le / shēng / bō / cóng / bō / fēng / xià / jiàng / dào / bō / gǔ / de / guò / chéng

这张图显示了声波从波峰下降到波谷的过程。

This diagram shows a sound wave descending from a crest to a trough.