All observers, whether teachers, students, amateur or professional astronomers, must remember: NEVER EVER LOOK THROUGH AN UNSHIELDED TELESCOPE AIMED AT THE SUN OR THE PARTIALLY ECLIPSED SUN !
(teachers, students, amateur or professional astronomers; must remember; ) (OR THE PARTIALLY ECLIPSED SUN; [is] NEVER SUN [of]; EVER LOOK THROUGH AN UNSHIELDED TELESCOPE AIMED AT THE)
teachers, students, amateur or professional astronomers OR THE PARTIALLY ECLIPSED SUN
must remember [is] NEVER SUN [of]
EVER LOOK THROUGH AN UNSHIELDED TELESCOPE AIMED AT THE