数学家的挑战在于，如何对这些简单群的完整集合进行分类。
The challenge for mathematicians became how to classify the complete set of these simple groups.
亚当：这个培养皿中有个完整的微生物群，中间那个看起来像雪花的是外来入侵者。
Adam: This plate has a whole herd of bacteria, with one frosty-looking colony in the middle.
一群蜜蜂把发动机当作了蜂房，发动机在蜂蜡中被完整地保存了下来。
A colony of bees had turned the engine into a hive and it was totally preserved in beeswax!
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