The channel is only a few centimeters in diameter, but that is wide enough for electrons to follow the channel to the ground in the visible form of a flash of lightning.

这个通道的直径只有几厘米，但它的宽度足以让电子以闪电这样看得到的形式随着通道到达地面。

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The simulator is 1.5 metres in diameter and is mounted on a frame that is 2.3 metres tall and 5 metres wide.

暴风模拟器直径1，5米，安装在高2，3米宽米的构架上。

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Stars range in size from neutron stars, which can be only 12 miles (20 kilometers) wide, to supergiants roughly 1,000 times the diameter of the sun.

恒星的尺寸范围从仅有12英里宽(20公里)的中子星到大约1000倍太阳直径的超大恒星。

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That cabin is a 14-ton spherical steel capsule only two meters in diameter, with a single,half-meter-wide circular plastic window for viewing.

VOA: standard.2010.06.21

Early estimates put it at 20ft (6m) deep and 30ft in diameter but officials have created a 100ft-wide safety zone fearing the top of the sinkhole is growing.

BBC: Florida sinkhole: Search for Jeffrey Bush called off

In the mid-1980s the smallest features on chips were 1 to 2 microns wide, about one hundredth the diameter of a human hair.

FORBES: Trick Of The Light