一种可能的解释是春季逐渐强烈的光照使得这些干冰膨胀破裂，挤压悬崖边疏松的土和冰滚落下来。

One possibility is that the spring sunshine caused blocks of the ice to expand and break apart, sending loose dust and ice particles crashing down the slope.

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然后藉由让一个不固定的圈套开始在常式期间以一条大的手巾复盖逐渐强烈的以便猫将会在区域中习惯于见到而且闻它。

Then start by leaving an unset trap covered with a large towel during routine feeding so that the cats will get used to seeing and smelling it in the area.

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但数天之后- - -一旦他们环月球航行后，正如从前一样- - -他们会报告说产生一种逐渐强烈的个体幸福感及昂扬的斗志。

But after a few days - once they've gone round the Moon, as it were - they report an enhanced sense of individual well-being and morale.

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