来自 retain,保持，-ion,名词后缀。引申词义记忆力。

1. He argues strongly for retention of NATO as a guarantee of peace.

他强烈要求保留北大西洋公约组织以维护和平。

2. They supported the retention of a strong central government.

他们赞成保留一个强大的中央政府。

3. The company needs to improve its training and retention of staff.

公司需要改进对员工的培训和留用工作。

4. They advocate the retention of our nuclear power plants.

他们主张保留我们的核电厂.

5. RETENTION parameter works best if the current undo tablespace has enough space for the active transactions.

retention能做好地工作如果----当前的回滚表空间对活动事务有足够的空间.