对于为什么应该定时进行备份(并测试这些备份的可恢复性)，有很多的原因。
There are lots of reasons why you should run regular backups (and test their recoverability).
通过测试不同密封胶样品在不同试验条件下的弹性恢复率，比较了它们的弹性恢复性能。
Test result indicates that silicone sealant has excellent elastic recovery under different conditions, and the two-component polysulfide sealant has relatively higher elastic recovery.
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