продолжительный

см. тж. иметь продолжительный срок службы

• The microscope makes possible lengthy (or prolonged, or protracted) investigations with small objects.

• The unit will function for extended (or prolonged) periods.

• Over the extended trial period the enlarger has exhibited ...

• Long-term storage ...

• Prolonged heating at such a temperature favours further grain growth.

• Prolonged service testing has proved that ...

• Long-term measurements ...

• The Plummer-Vinson syndrome is usually found in women after long-standing iron deficiency.