特别是可取代粉笔的大量生产环节，减少教学经费开支。

In particular, it can be substituted for links of mass-production of chalk, and can reduce the educative expenditure.

youdao

特别是可取代粉笔的大量生产环节，减少教学经费开支。

In particular, it can be substituted for links of mass-production of chalk, and can reduce the educative expenditure.

youdao