It is a self frequency double laser in some hosts.
选择合适的基质，可产生自倍频可见激光。
Nicole Ellison of Michigan State University found that the frequency of networking site use correlates with greater self-esteem.
密歇根州立大学的尼科尔·埃里森发现，社交网站的使用频率与自尊心的强弱有正相关。
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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