But since then, detector sensitivity has improved 1,000- fold, and instrument builders expect soon to wring out another factor of 1,000.
But since then, detector sensitivity has improved 1,000- fold, and instrument builders expect soon to wring out another factor of 1,000.
即使是当时最佳仪器的灵敏度，与测得假定的暗粒子所需的灵敏度相比，仅及1/1000。