The labio-dental sounds are articulated by the lower lip against the upperteeth, eg. /f/.
唇齿音由下唇与上齿连接发出,例如 /f/。
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To see how the brain responds to pain emanating from different teeth, the researchers used fMRI to monitor changes in activity when the upper tooth or the lower tooth was zapped.
The species is the only known modern frog species with lowerteeth, though certain other species with upperteeth do have toothlike structures on the lower jaw.