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。
2
During nearly one hour of continuous call testing, the voice service demonstrated good quality and stable signals, while the EVDO data service smoothly and steadily play online videos.
在近一个小时的连续呼叫测试中，语音质量良好，信号稳定，而EVDO的在线视频播放，数据平滑稳定。
3
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.