Researchers re-injectedparticles late last month, but it was not until this weekend that bunches of protons were once again whizzing around the collider's entire circumference.
上个月，研究者们已再次注入粒子，但直到这周，那批刚注入的质子束才沿着对撞机的圆周完整地急速循环。
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Their study involves particles of silver — 1/50,000th the diameter of a human hair — that are injected into the bloodstream.
他们的研究将相当于人类头发丝5万分之一大小的银粒子注射入血流。
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In order to track the movements of the cells, his team attached tiny magnetic particles to them before they transplanted them, and also injected them with a dye.