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устойчивые колебания stresses
account.	sustained fluctuations
automat.	steady oscillations; steady state oscillations; steady oscillation
electr.eng.	steady-state oscillations; undamped oscillations
energ.ind.	sustained oscillations
geophys.	stable oscillations
seism.	stationary vibratings
tech.	steady-state oscillation; stable oscillation; sustained oscillation; undamped oscillation
устойчивое колебание
construct.	stationary vibration

устойчивые колебания: 3 phrases in 3 subjects

Astronautics	1
Robotics	1
Technology	1