yí / gè / xiǎo / xiǎo / de / gōng / yì / xíng / dòng / zuì / hòu / fā / zhǎn / chéng / le / xīng / huǒ / liáo / yuán / de / shè / huì / huó / dòng

一个小小的公益行动，最后发展成了星火燎原的社会活动。

A small charitable initiative eventually grew into a widespread social movement.