1. Once known[状语1], it spread rapidly[主句], driving out water clocks but not solar dials[状语2], which were needed to check the new machines against the timekeeper of last resort.[定语从句]
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2. Evolutionary biologists[主语] believe[谓语] that speciation[宾语从句], the formation of a new species, often begins[同位语] when some kind of physical barrier arises and divides a population of a single species into separate subpopulations.[状语从句]
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