sub

In a sentence

• Vaig veure un sub navegant per l'oceà.

  I saw a submarine sailing in the ocean.

  Here, "sub" is a standalone word used as a colloquial short form for "submarí," meaning "submarine".

• Aquest cable connecta al sub sistema de control.

  This cable connects to the control subsystem.

  In this case, "sub" is a prefix in "sub sistema," indicating a subsystem or a subordinate system.

• Ha participat en un projecte sub finançat per una organització internacional.

  He participated in a project sub-financed by an international organization.

  Here, "sub" is a prefix used in "sub finançat" to indicate partial or subsidiary financing.