地球上复杂生命的发展依赖于细菌的存在，而细菌可以被更大的有机体所吞噬。
The development of complex life on Earth depended on the presence of bacteria that could be consumed by larger organisms.
我们研究了那里的水质，并在其中发现了这种能够吞噬硫化物的细菌。
问题是，虽然胞内同生在真核生物中非常常见，这往往造成吞噬其他细胞，但是在较为硬质的细菌难以察觉。
The trouble is that, while cells within cells are common in eukaryotes, which often engulf other cells, they're vanishingly rare in more rigid bacteria.
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