当储墨管插上笔头组件后，凸管顶破封膜，使墨水流向笔尖，即能书写。

After the ink tube is inserted in the pen head component, the seal film is broken by the convex tube upwards, ink flows into a pen point, and a user can write.

youdao

当储墨管插上笔头组件后，凸管顶破封膜，使墨水流向笔尖，即能书写。

After the ink tube is inserted in the pen head component, the seal film is broken by the convex tube upwards, ink flows into a pen point, and a user can write.

youdao