但是，所有这些DNA需要高能耗，大量成本甚至削弱巨大的细菌——阻止它们成为更为复杂的真核生物。
But all this DNA has a big energetic cost that cripples even giant bacteria — stopping them from turning into more complex eukaryotes.
地球上最大的生物群是海底一块块由类似纤细意大利面条的巨大多细胞细菌组成的地毯。
Among the biggest masses of life on the planet are carpets on theseabed formed by giant multi-cellular bacteria that look like thinstrands of spaghetti.
泰坦尼克号的毁灭，由巨大冰山开始，由微小噬铁细菌结束。
The destruction of the Titanic, started by a huge iceberg, will be finished by tiny, iron-eating bacteria. Karen Hopkin reports.
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