But on April 18, the team saw several active dust devils leaving surprisingly bright tracks.

不过在4月18日，研究小组目睹了几场活跃的尘暴留下了令人惊讶的明亮痕迹。

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Secondly, the probe could have an active radar or lidar defense that targets debris and uses lasers to vaporize the dust particles.

第二，探测器可能有主动雷达或者激光雷达防御系统，可以发现碎片，并用激光来汽化这些颗粒。

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The team chose 140 active galactic nuclei, or AGNs, by selecting galaxies that emit a lot of X-rays, which can Pierce the galactic gas and dust that might otherwise block the nuclei from view.

课题小组选择了140个活动星系核，或简称agns，这些星系都放射出大量的X射线，X射线能穿透阻挡观测的气体和尘埃。

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As previously reported by The Wall Street Journal, the new phone, tentatively called the Galaxy S 4 "Active, " would be waterproof and dust proof.

WSJ: Pentagon Expects to Enlist Apple, Samsung Devices

The 5140i is a tri-band handset designed for "active-minded consumers" (as opposed to the rest of us sluggishly-minded folk) that offers dust and splash resistance and "durability, " which is apparently not a feature found in other phones.

ENGADGET: Nokia intros 5140i fitness phone