pencil是可数名词。
pencil：n.铅笔；v.用铅笔写(或画、作记号)；例如：He was rolling a pencil between his fingers.
He was rolling a pencil between his fingers.
他用手指捻动着铅笔。
The comments in pencil haven't photocopied very well.
用铅笔写的评语没有复印清楚。
We've pencilled in a meeting for Tuesday afternoon.
我们暂定星期二下午开会。
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