It was dark as the pits of Ganymede or the under-surface laboratories of Pluto.
There was the swirl of brown water that marked its under-surface progress.
Pass your hand across the under-surface, and it is prickly and rough.
This may apply also to the case in which the under-surface only is spongy and soft.
I raised it, so that the surgeon could look at the under-surface of the leg.
On no account should the under-surface be gummed all over and the whole stamp stuck down to the page of the hook.
When first hatched out the young fish have a large translucent protuberance on the under-surface.
He then rubs the under-surface, with the result that undesirable matter falls into the strained latex.
To this family belong the Ash trees, so called on account of the appearance of the under-surface of their leaves.
The foreglow began to brighten the under-surface of the stratus-cloud with orange, and patches of white mist filled the hollows.