1. He's a quiet unobtrusive student, but always does well in the examination. ���Ǹ���Ĭ���ԣ�������עĿ��ѧ���������Ŀ��Գɼ����Ǻ����졣
2. This provides an unobtrusive backdrop for the works of art, which are predominantly hung on the walls. ���ṩ��һ�������۵ı�����������Ʒ��������Ҫ�ǹ���ǽ�ϡ�
3. Listening to some quiet and unobtrusive music is my favorite way to find some tranquility after a long day. ��������һ�������һЩ����ƽ�͵���������Ѱ����������ѷ�����