sketchbook

The artist always carries a sketchbook to draw interesting people he sees on the bus.

(Chinese) 这位艺术家总是随身带一个素描本，画他在公共汽车上看到的有趣的人。

She filled her entire sketchbook with drawings of local flowers and trees during the trip.

(Chinese) 旅行期间，她在素描本里画满了当地的花草树木。