Researchers re-injected particles 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.

为了追踪这些细胞的活动，他的科研团队再将干细胞植入鼠脑之前，把微小的磁性颗粒黏附在细胞之上，并把标记染料注入细胞内。

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These particles are injected directly into the target tumour, rather than relying on the leaky walls of tumour capillaries to get them to the right place.

ECONOMIST: Treating tumours

Nor is it an attempt to win newcomers over to a particular world view - the guests are not being forcibly injected with Blairite nano-particles.

BBC: Breakfast at Tony's

When it is injected into muscle, the AAV particles are sucked up by the hand-like protrusions connecting muscles with the nervous system, all the way back up into the spinal cord.

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