Release（英语单词）
音标（Phoneticsymbol）：[ri'li:s].词性及解释Part of speech and defination.
n.释放，发泄，豁免，发行，释放证书.
vt.释放，解除，放松，豁免，免除，发布，放弃，让与.n.发布；
公映的新影片，发布的新闻[消息].
【计】版本，发布.【经】释放，公布.
中文名Release
Phonetic symbol
Part of speech and defination
释放， 发泄
派生词
其adj是releasable（能释放的，可免除的），其n是releasee（被免除债务者，受让人），
其n（指人）是releaser（释放者，排气装置），亦有releasor（放弃权利者，让渡人）。
真题例句
Alaska State Troopers released a statement saying they’ve arrested Arnold Demoski,26
These patterns suggest that some types of mental flexibility decrease relatively early in adulthood, but that the amount of knowledge one has, and the effectiveness of integrating it with one's abilities, may increase throughout all of adulthood if there are no diseases, Salthouse said in a news release.[1]
函数
英文解释
IUnknown::Release Decreases the reference count of the interface by 1.
ULONG Release();
Parameters：
None
Return Values：
Returns the new reference count. This value is for diagnostic and testing purposes only.
Remarks：The object that exports the interface deallocates itself when its total reference count reaches 0. Use the IUnknown::AddRef method to increase the interface's reference count by 1.
Applications must call this method to release only those interfaces that were explicitly created in a previous call to IUnknown::AddRef,IUnknown::QueryInterface, or a creation function, such as Direct3DCreate9.
Requirements：
Header: Declared in Unknwn.h.
中文解释
作用:
将dx接口的数量减1，即释放当前接口
函数原型：
ULONG Release(VOID);
返回值：
返回新的接口数。 此数值紧用于诊断和测试。
附注：
当继承接口而来的对象的总引用数量达到0时，他会释放自己。使用IUnknown::AddRef 函数可以增加
应用程序必须调用此函数释放这些接口，这些接口包括之前调用 IUnknown::AddRef IUnknown::QueryInterface产生的，也包括通过一个产生函数比如Direct3DCreate9，产生的。
注：引自DirectX sdk文档（翻译不太准确，参考）。
定义
在QC中
QC是Quality Center 的缩写.
A Releaserepresent a group of changes in an application ,which are ready for distribution at the same time.
在Quality Center中，人们常常需要辨析Cycle 和Release，这里的Cycle的释义为：
A cyclerepresents a development and QA cycle based on the project timeline.
在dhvp中
1.client广播discover报文寻找dhcp服务器
2.dhcp-server回复offer报文
3.clinet正式发送request报文请求地址
4.server回复ack
这是整个dhcp获取ip地址的基本流程
但是在某些情况下client在获取dhcp-server给其分配的地址后会放弃该地址，
此时，client主动放弃地址就会向dhcp发送release报文解约。