俄语 ⇄ 英语 +

продолжительное исследование 强调
研究与开发	extended research (Ivan Pisarev); prolonged investigation (Ivan Pisarev); longitudinal research (Ivan Pisarev); extended study (Ivan Pisarev); continuous study (Ivan Pisarev); follow-up study (Ivan Pisarev); persistent investigation (Ivan Pisarev); panel study (Ivan Pisarev); multi-year study (Ivan Pisarev); prolonged analysis (Ivan Pisarev); marathon study (Ivan Pisarev); extended research project (Ivan Pisarev)
职业健康和安全	longitudinal study; long-term study