в течение длительного времени
I
• The transform boundary will not remain for long in its original location.
• The pressure increase acts over a long period (of time).
II
• There is no prospect of exhaustion of this metal for a long time to come.
• An open vessel filled with a superfluid will not stay filled for long.
• The neutrino was long thought to be mass-less.
Источник:
Русско-английский научно-технический словарь
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