它显示了JVM生存期间，各个垃圾回收周期的顺序。
It shows the sequence of garbage collection cycles that occurred throughout the life of that JVM.
这样就能够在垃圾回收周期的频率和长度之间实现最佳的平衡。
This creates the best balance between the rate and length of garbage collection cycles.
创建许多对象还容易增加堆碎片，而这会导致出现更多的垃圾回收周期。
Creating many objects also tends to increase heap fragmentation, which leads to even more garbage collection cycles. For example, do not create objects prematurely.
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