However the researchers can? T be absolutely sure that the two signals they measured were dark matter and not some other particle, which they call background.

但研究者们还是不能绝对确信他们所测到的两个信号跟暗物质有关，因为有可能是背景的其他粒子干扰所致。

youdao

Well, we still don't quite understand the exact nature of dark matter, but highly precise measurements of positron fraction (the ratio of positrons to electrons and protons) do bring us a small step closer to proving the existence of the theoretical material.

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