Bird trace silk
Bird trace and insect silk is a Chinese idiom, pronounced Ni ǎ OJ ì ch ó ngs ī, which refers to things that are easy to disappear.
explain
It refers to things that are easy to disappear.
source
Jiang Shiquan's Linchuan dream, a dream in Qing Dynasty: "nanny really believes in people. Thank you very much. I feel sorry for him for keeping bird tracks and insect silk in prison. You can see it again and again in the evening. "
Bird trace silk