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сосредоточение силы stresses
mil.	accumulation of power
сосредоточение сил
mil.	mustering strength; force concentration; concentration; accumulation of combat forces (для вооруженной борьбы theguardian.com Alex_Odeychuk); the massing of forces (cnn.com Alex_Odeychuk)
mil., arm.veh.	build-up in strength

сосредоточение силы: 32 phrases in 3 subjects

Chess	2
Military	28
News style	2