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。
2
Protect ends with capped self-locking washers incorporating a spring steel insert to ensure permanent retention of cap in exposed locations.
对外露端部的保护，可采用自锁螺帽加以弹簧垫，以确保螺帽持续牢固的预紧力。
3
However, subliminal messages in self-help tapes do not enhance human performance, and techniques for quick learning can hurt long-term retention.