Assertion: microscope's specimen | /r/HasProperty | flat
Facets:
value: perfectly
type: DEGREE
Source sentences:
text: You can, of course, refocus slightly to bring it in, but then the center part of the image will be a bit out of focus (and this is all assuming that the specimen is perfectly flat, which is not usually the case!)
text: Most specimens are mounted on slides, flat rectangles of thin glass.