He used it very carefully, and rarely lent it to his brother, but for all that the walls were covered with blue and red drawings as time went on, and the pencil got smaller and smaller.

他非常小心地使用它，很少借给他弟弟，但随着时间的推移，墙壁上到处都是蓝色和红色的图画，铅笔也越来越小。