按 ㄢ ˋ àn 图 ㄊㄨ ˊ tú 索 ㄙㄨㄛ ˇ suǒ 骥 ㄐㄧ ˋ jì 按 ㄢ ˋ àn 圖 ㄊㄨ ˊ tú 索 ㄙㄨㄛ ˇ suǒ 驥 ㄐㄧ ˋ jì lit. looking for a fine horse using only a picture (idiom) fig. to do things along rigid, conventional lines to try and find sth with the help of a clue