A dead letter is a dead letter
As a Chinese idiom, Pinyin is s ǐ Bi ā ob á ICH á n, which means to be entangled. It comes from the marriage story of awakening the world.
The origin of Idioms
The 38th chapter of the romance of awakening the world written by Xi Zhou Sheng in Qing Dynasty: "if it wasn't for Di Zhou's death, he would seize the opportunity to escape."
Idiom usage
Used as a predicate or attributive; used in writing.
A dead letter is a dead letter
establish an estate and hand down an inheritance - chuàng yè chuí tǒng
Promoting officials with the help of the party - yǐ dǎng jǔ guān
be in harmony in appearanc but at variance in heart - mào hé xíng lí
appreciation goes without saying - tāo zài zhī jǐ