Back and forth
Chinese idiom, Pinyin is y ó Uhu í m ó Zhu ǎ n, which means to describe not knowing how to do well. It comes from Jin Ping Mei CI Hua.
The origin of Idioms
Chapter 51 of Jin Ping Mei's Ci Hua: "Dai an came to his home and looked for books everywhere. When he got them, he just wandered back and forth."
Idiom usage
Used as an adverbial; used in writing.
Back and forth
the beautiful rivers and mountains - jǐn xiù hé shān
an inch of silk and half a grain of rice -- a little bit - cùn sī bàn sù