The element tree can be further divided into two discrete yet sometimes parallel trees: the logical tree and the visual tree.
可以进一步将元素树分为两个离散但有时会并行的树：逻辑树和可视化树。
Sometimes tasks performed sequentially could be done in parallel.
有时按顺序执行的一些任务也可以并行执行。
Prisons are sometimes called universities of crime, but surely this is a parallel nobody expected.
监狱有时被称作罪恶的大学；但毫无疑问，这是没人预料到的。
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