To use the cache, call the API to determine whether an object was previously cached.
要使用缓存，需要调用API来确定先前是否已缓存了对象。
To place and get an object from the cache you use put and get methods.
要在缓存中放置和获取对象，请使用put和get方法。
To place and get an object from the cache you use put and get methods.
要在缓存中放置和获取对象，请使用put和get方法。
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