Strictly defined, an observable should be a measure which other people can investigate and accurately verify, a measure which describes a precise variable.
(an observable; should be; a measure which other people can investigate and accurately verify, a measure) (a measure; can investigate; other people) (other people; accurately verify; a measure which describes a precise variable) (a measure; describes; a precise variable)
an observable a measure other people a measure
should be can investigate accurately verify describes
a measure which other people can investigate and accurately verify, a measure
other people
a measure which describes a precise variable
a precise variable