1.In the mark phase, all the objects in the heap are "marked" with a bit.
在mark阶段，heap内的所有对象均以一个bit“标记”。
2.As with the mark phase, the cost of sweeping dead objects back into the free memory pool can't be completely predicted.
与标志阶段类似，将死对象清理回自由内存池的耗费也不能完全预测。
3.The parameter reduces the time spent in mark and keeps the mark phase running, even if a GC cycle is not in process.
此参数缩短了花在mark上的时间并在GC循环未在进行中时仍能保持mark阶段运行。
4.In the mark phase, all the "live" objects are added to mark vector.
在标记阶段，将所有“活的”对象添加到标记向量。