dāng / wǒ / men / bǎ / xiàn / duàn / bù / duàn / fēn / gē / shí / měi / yì / xiǎo / duàn / dōu / kě / yǐ / kàn / zuò / wú / xiàn / xiǎo / de / bù / fen

当我们把线段不断分割时，每一小段都可以看作无限小的部分。

When we keep dividing a line segment, each small segment can be treated as an infinitesimal part.