Assertion: diatom's shape | /r/HasProperty | symmetrical
Facets:
value: usually
type: DEGREE
value: in most cases
type: TEMPORAL
value: bilaterally
type: DEGREE
Source sentences:
text: In most cases, the shape of frustules is bilaterally symmetrical.
text: Their shapes and structure are usually highly regular and symmetrical, and these features are used to identify and classify them.