pencil

The art student used a sharp pencil to draw the initial sketch of the mountain landscape.

(Chinese) 美术生用一支尖铅笔画出了山脉风景的草图。

You should use a pencil for the math exam so you can easily erase any mistakes.

(Chinese) 数学考试你应该用铅笔，这样你可以轻松擦掉任何错误。