内存是缓存的最佳持久性存储，因为访问时间(实际上)是即时的并且RAM的容量通常都很大(或者容易聚集在一起)。
Memory is the best persistent store for a cache because access time is (practically) instantaneous and RAM is typically plentiful (or cheap to amass).
你们知道其中的道理吗？单独一支容易折断，聚集在一起就很难被摧毁。
Do you know the reason behind? A single arrow can be easily broken, but assembled together, the arrows will be hard to destroy.
而碳原子相对稳定，所以科学家们施展化学技巧使碳原子之间更容易发生反应，让它们聚集在一起。
Carbon is boringly stable, so scientists deploy chemical tricks to make the atoms more reactive, allowing them to bind.
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