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From LSJ

μεγάλα ὠφελήσεσθε πρὸς ἱστορίαν τῶν κοινῶν → that will be of great benefit to you in order to understand public affairs

Source

Russian > Greek

κατέχω, εἴργω, εἵργω, ἔργω, ἔργνυμι, ἐέργω, ἐέργνυμι, ἐπίσχω