She scribbled a note in pencil.

她用铅笔草草写了张便条。

She wrote in pencil.

她用铅笔写的。

The comments in pencil haven't photocopied very well.

用铅笔写的评语没有复印清楚。

'What I like to say is that nature writes some things in pencil and some things in pen,' she says.

她说：“我想说的是，大自然有些东西是用铅笔写的，有些东西是用钢笔写的。”

That letter was written in pencil.

那封信是用铅笔写的。