还有其他的解决方案如cookie会话仓库(会话长度有限，不能在会话中存放敏感数据)，memcached(无法持久化+难以实现高可用性方案)。

There are other possible solutions like cookie session store (session size is limited, no sensible data in sessions), memcached (too much RAM when you have many sessions + no persistence).

youdao

这对我们来说是一项艰巨的集成任务，而且曝露了不少难以解决的微妙问题，比如异常处理、并发性、安全性、以及持久性上下文管理。

This was a difficult integration task for us, and exposed several subtle issues that were difficult to address like exception handling, concurrency, security, and persistence context management.

youdao

两冲程汽油动力的工具的环境污染和噪音是众所周知的厉害，但电动的替代品又往往持久力不足，难以实际使用。

Two-stroke, gas-powered tools are famously polluting and loud, but electric variants typically lack the power or durability to really be practical.

youdao