We have already mentioned the problems associated with insuring high frequency, low severity events and they certainly fall into the self-retention category.

我们已经提到过一些跟高频率低幅度的事件有关的风险，它们肯定归入自我保留一类。

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ASP has high water-reducing rate and low slump loss, but it is expensive, and the water-retention of concrete is bad, which limit its application.

氨基磺酸系高效减水剂asp的减水率高、坍落度损失小，但价格较高、混凝土保水性差，限制了其应用。

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As spatial learners, they need to take notes when learning something new; if they simply hear a lesson, chances are good that their retention will be low.

他们在学习新内容时需要记笔记，如果单单是听一堂课，那么他们的记忆效果是很差的。

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