Half a meter is OK in the United States.

在美国，半米是可以的。

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Suppose you had a disk in your car which had a radius of half a meter.

假设车里有个圆盘，半径为半米。

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Bales are often about a meter long and half a meter high and wide.

禾捆通常一米长，半米高半米宽。

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It stands about half a meter tall and has a blue body and a friendly face with big eyes.

VOA: special.2009.12.17

The Democrats met just three blocks from the White House, but with half a meter of snow on the ground from a winter storm, the trip became dangerous.

VOA: standard.2010.02.06

The group Defenders of Wildlife describes black bears as between a half-meter and three fourths of a meter at the shoulders.

VOA: special.2011.06.21

Inside the riser pipe is a space about half a meter in diameter, large enough to hold the spinning drill pipe and bit and to allow the return flow of drilling fluid.

FORBES: The delicate art of sucking up

The two clouds were separated by about half a meter, and were constantly affected by a combination of lasers and magnets, which had the effect of maintaining the entanglement for about an hour.

FORBES: New Technique Could Pave the Way for Quantum Information Networks

Using this phenomenon physicists have been able to transfer -- or in effect teleport -- the properties of one particle to another, in the case of atoms over a distance of about half a meter, in the case of photons over tens of kilometers.

CNN: Beam me up: Just how close are we to teleportation?