Families are not searchable from an outside source and invites are tightly controlled.

Some fund companies have the wherewithal to finance this expense themselves, while others turn to an outside source.

As they are not associated with any landmass, banks have no outside source of sediments.

Instead of a sustaining chain reaction, a subcritical reactor uses additional neutrons from an outside source.

Rams were often used in remote locations, since it requires no outside source of power other than the kinetic energy of falling water.