Atlas may be extended to provide alternate implementations of architectural mechanisms (such as persistence or security) that extend the base Atlas framework.
扩展atlas，以提供扩展了基本atlas框架的架构机制(例如，持久性或安全性)的实现。
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Leaves alternate, sessile, terete, fleshy, base expanded, apex obtuse or aristate awned; leaf axil fascicular pilose.