340.The Internet had its origins in a 1969 U.S. Defense Department computer network called ARPAnet, which stood for Advanced Research Projects Agency Network.
互联网的前身是1969年美国国防部建立的名为阿帕网的计算机网络，阿帕网代表“高级研究计划署网络”。

六级词汇讲解：
本句的主干是The Intemet had its origins...。which引导的非限制性定语从句修饰ARPAnet。have one's origin in...意为“起源于，追溯至……。如：

The great depression ofthe economy has its origins in the trade for a decade.
经济的萧条源于该国过去十年间的贸易行为。

stand for意为“代表，象征”。如：
It is known to all that the olive branch stands for peace.
众所周知，橄榄枝象征着和平。

英语六级考点归纳：
与stand相关的短语还有：

stand by意为“支持，支援；袖手旁观”。如：
1 won't stand by and watch others humiliate her in public.
我不会坐视着她在公共场合被人羞辱的。

stand out意为“突出；杰出”。如：
That pretty girl stands out in a crowd.
那个漂亮的女孩在人群中很出众。

stand off意为“远离；避开”。如：
He's trying to stand offher in public.
他有意地在公共场合避开她。

stand up to意为“经得起；勇敢地面对”。如：
The cancer patient said he would stand up to death.
这名癌症患者说，他将勇敢面对死亡。