One possible explanation for these positrons is the mutual annihilation of the matter and antimatter forms of a type of dark matter called weakly interacting massive particles, also known as WIMPs.

对这些正电子有一个可能解释，就是它们来自同一种暗物质以正、反物质形式出现的一对粒子的碰撞（物质湮灭），这样的暗物质又被称为“大质量弱相互作用粒子”（WIMP）。

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Either way, one sign of dark matter particles, researchers think, is a burst of annihilation-induced gamma rays.

科学家们认为，无论是这两种解释的哪一种，暗物质颗粒的一种标志是粒子湮没爆发出的伽马射线。

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The observations have significantly decreased the chances that the antimatter is coming from the annihilation or decay of astronomical dark matter.

观测明显的降低了反物质来自于庞大暗物质的湮灭或衰变的可能性。

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"It is a so-called 'smoking gun' signal of dark matter annihilation, " Prof Bergstrom told the BBC.

BBC: Fermi telescope may change to dark matter hunting