如何使用 "retention" 造句

1. This would imply retention of a small expeditionary force .
这意味着需要保留小规模的远征军。
2. Rules for document retention presume paper records .
文档的产权保持力规则仍停留于纸质文档。
3. Weight gain from fluid retention
因体液潴留而体重增加
4. Previewing key information and then sleeping on it increases retention 20 to 30 percent .
预习关键信息,然后睡觉,有助于提高20%到30%的记忆力。
5. The answer is user retention .
答案是为了保留用户。