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
Banks that needed equity but dithered last year discovered to their cost that the pool of available capital was not limitless; they had to pay far more for it later, if they could get it at all.