记得小时候上三年级，学校除了让我们学国文、算术外，还增添了学写毛笔字的课程。
O O B-Time I-Time I-Time O O O O O B-Organization I-Organization O O O B-Person I-Person O B-Thing I-Thing O B-Thing I-Thing O O O O O O O O B-Thing I-Thing O O B-Thing I-Thing O