For instance, length can be defined as a class where a length measured in meters will be the only nonvirtual component, while other measurements are virtual: class length: var m : num ;
(length; can be defined; as a class) (a length; measured; in meters) (a length measured in meters; will be; the only nonvirtual component; L:a class) (other measurements; are; virtual)
length a length a length measured in meters other measurements
can be defined measured will be are
as a class
in meters
the only nonvirtual component L:a class
virtual