The HTTP protocol supports a method head, which is designed to return only HTTP headers, but no content.
HTTP协议支持方法HEAD，它设计成仅返回http头而不返回内容。
Tunneling (RFC 2893) : it allows you to encapsulate one packet head into the other and one protocol will communicate with others through the encapsulation in the other protocol.
隧道技术(RFC 2893)：是指将一种协议报头封装在另一种协议报头中，这样，一种协议就可以通过另一种协议的封装进行通信。
Review and revise clinical documents like protocol, case report form, etc, ensure it get approval from country medical director and appropriate central medical head.
审核修改临床研究协调员撰写的临床研究方案，病例表格等研究文件，保证得到区域和总部相关部门的批准；
The new protocol finds the path to the cluster head with the minimum cost, using an algorithm similar to flooding to propagate the cost information and greedy algorithm to find the lowest cost link;
节点根据能量消耗的代价来选择至簇头的路由，通过扩散算法来广播代价消息，采用贪婪算法来选择能量消耗最小的路径；
The new protocol finds the path to the cluster head with the minimum cost, using an algorithm similar to flooding to propagate the cost information and greedy algorithm to find the lowest cost link;
节点根据能量消耗的代价来选择至簇头的路由，通过扩散算法来广播代价消息，采用贪婪算法来选择能量消耗最小的路径；
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