Usages of gōngběnfèi
我 已经 缴费 了， 工本费 不 高。wǒ yǐjīng jiǎofèi le, gōngběnfèi bù gāo.
I have already paid the fee; the document production fee is not high.
这 是 工本费。zhè shì gōngběnfèi.
This is the document production fee.
Elon.io is an online learning platform
We have an entire course teaching Chinese grammar and vocabulary.