Physically the rocks break down into and smaller pieces after.从物理变化来讲,岩石碎成越来越小的石块.Physically, the rocks break down into smaller and pieces.物理方面, 岩石会风化成小片小片的碎条.Physically, the rocks break down into smaller and smaller pie...

break down into的音标：break down into的英式发音音标为：[breik daun 'ɪntuː]break down into的美式发音音标为：[brek daʊn 'ɪntu]...

分成不同种类；分解成…...