Assertion: bronchiole's number | /r/HasProperty | estimated
Facets:
value: several times
type: TEMPORAL
value: by counting their openings
type: MANNER
Source sentences:
text: Alveolar number is estimated by counting their openings, which are regarded at the level of the free septal edges, where they form a two-dimensional network in three-dimensional space.
text: Using various methodologic approaches, the number of alveoli in the human lung has been estimated several times.