这种正统的宇宙观现在正受到天文学家的挑战。天文学家认为，一场巨大的气体“雨”正从星系周围所谓的空无一物的空间落入许多星系中。
This orthodox view of the universe is now being challenged by astronomers who believe that a heavy "rain" of gas is falling into many galaxies from the supposedly empty space around them.
当我们上飞机的时候，通常已经很累了，而拥挤的空间和不稳定的网络使工作更具挑战性。
We are usually tired already by the time we get on a plane, and the crowded space and unstable internet connection make work more challenging.
所有这些都是为了“降低难度，向你的水平靠拢”，但是这样一来，挑战的空间和获得惊喜的可能就大大降低了。
The effect of all this was to “lower the rock to your level”, removing its capacity to challenge and surprise.
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