dead letter 是什么意思

	mail that can neither be delivered nor returned 同义词：dead mail,
	the state of something that has outlived its relevance 同义词：non-issue,

	1.	The will itself is made a dead letter . 遗嘱本身成了一纸空文了。
	2.	Greek was a dead letter to him . 希腊文他可是一个字也不识。
	3.	Rules and regulations , once set up , should not be turned into a dead letter . 规章制度一经订立，不应成为一纸虚文。
	4.	Laws are a dead letter without courts to expound and define their true meaning and operation . 法律如果没有法院来详细说明和解释其真正意义和作用，就是一纸空文。
	5.	Hope it s not chucked in the dead letter office 但愿没有被丢进死信保管处。
	6.	It is regrettable that our appeal remains a dead letter 遗憾的是，我们的呼吁没有得到响应。
	7.	It is regrettable that our appeal remained a dead letter 很遗憾，我们的呼吁竟如同泥牛入海。
	8.	Many people say that detente is now a dead letter 很多人说缓和国际紧张局势的论调已是明日黄花。
	9.	In our department , this rule has become a dead letter 在我们这个部门，这条制度已成为一纸空文。
	10.	A bit like the dead letter department ofthe post office , i ' m afraid 这里怎么像邮局的信件储藏室一样。

dead letter是什么意思