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долговременное испытание stresses
construct.	long-term test
el.chem.	long-time test
долговременные испытания
el.	exhaustive test; long-term test; long-time test
mil., arm.veh.	extended service tests
oil	long-term testing (serz)
долговременные длительные испытания
auto.	long-term test; long-term testing

долговременное испытание: 3 phrases in 3 subjects

Astronautics	1
Chemistry	1
Natural resourses and wildlife conservation	1