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.

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。

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In addition, the company's hydraulic motors will drive 32 special tires that contact the 648-foot diameter wheel, making it rotate at a constant speed of three times an hour.

此外，该公司的液压马达将带动32条特制轮箍，而这些轮箍连接到这个直径为648英尺高的摩天轮，使其以每小时旋转三次的匀速旋转。

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The planned telescope will have a 21-foot diameter mirror, six times as big as Hubble's.

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This was not a luxury afforded to Baumgartner and his capsule, however, which is a 6-foot diameter pressure sphere.

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According to Michaud, an AVE power station with a 656-foot diameter could generate 200 megawatts of clean electricity at a price as low as 0.03 cents a kilowatt-hour.

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