Assertion: metric system's unit | /r/HasProperty | many more
Facets:
Source sentences:
text: Over the years the definitions of the meter and kilogram have been refined and the metric system extended to incorporate many more units.
text: It was originally based on the and the introduced by the First French Republic in 1799, but over the years the definitions of the metre and the kilogram have been refined, and the metric system has been extended to incorporate many more units.