Vitamin E, for example, which is found in vegetable oils, nuts and green leafy vegetables, has been linked (in mice) with the retention of memory into old age, and also with longer life.
例如，植物油，坚果和绿叶蔬菜中维他命E与保持记忆力到老，也与长寿有关（老鼠实验）。
The third phase of sleep, REM sleep, is known to promote memory retention of learning that took place during the day.
第三阶段的睡眠，即动眼睡眠，能够帮助记忆那些白天学到的东西。
The retention policy, which is an important part of implementing Annotations, is based on how long the data needs to be kept in memory. There are three different types of retention policy
保持策略（retention policy）是实现注解的重要一环，根据数据在内存中保持时间的长短，有三种类型的保持策略
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