lǎo / shī / zài / zhēn / zhān / shàng / chā / mǎn / le / cǎi / sè / de / zhēn / fāng / biàn / xué / shēng / liàn / xí

老师在针毡上插满了彩色的针，方便学生练习。

The teacher stuck colorful needles into the felt pincushion so the students could practice.