沿著公路往优胜美地山谷前进，约莫十几分钟后，来到了瓦乌纳隧道（Wawona Tunnel），在隧道出口前，隧道上方就有灯号提醒驾驶人减速，前方有行人穿越，原来隧道出口处就是一个景点，叫隧道观景点（Tunnel View），...
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地下的隧道迷宫里，罗马人保留着“他们能够带来的各种类型的外来动物”，包括犀牛和蛇，纳扎罗说。
In the underground maze of tunnels, the Romans kept "every type of exotic animal that they were able to bring here," including rhinos and snakes, Nazzaro said.
独特之处： 直径达76英尺的耶尔瓦布埃纳岛隧道是世界上最宽的单孔隧道，1936年11月，这项令人印象深刻的工程落成开通。
Why It's Unique: With a 76-foot diameter, Yerba BuenaIsland Tunnel is the world's widest single-bore tunnel, an impressivefeat considering it opened in November of 1936.
虫洞理论是爱因斯坦提出并由纳森•罗森完善的。虫洞就是连接两个遥远时空的多维空间隧道。
Wormhole Theory is proposed by Einstein and perfected by Nathan Rosen. Wormhole is a multi-dimensional space tunnel connecting two distant Spaces.
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