用

用

"Use" or "to use."

In this sentence, '用' means 'to use' and indicates the instrument or means by which the action is performed.

我用毛笔写了一封信。

I wrote a letter using a brush.

Here, '用' means 'made of' and specifies the material used to create the object.

这个盘子是用瓷器做的。

This plate is made of porcelain.

In this case, '用功' is a compound word where '用' contributes to the meaning of 'diligently' when combined with '功'.

用功学习可以取得好成绩。

Studying diligently can yield good results.