单语范例（未经PONS编辑处理）
The etching removed approximately 0.00015in um of aluminum leaving the "pure silicon" particles prominent to form the bore surface.
en.wikipedia.org A similar study by the same researchers examined uh and um in spontaneous speaking.
en.wikipedia.org The spore print is olive-brown, and the spores are ellipsoid, smooth, and measure 811 by 35 um.
en.wikipedia.org They zoomed by so quickly it was hard to tell, um, the type of bike they were riding.
en.wikipedia.org The size varies from 6.5 to 8 um.
en.wikipedia.org