Transactions within a document are cheap, and the costofstorage is relatively cheap as well.
事务在一个文档是便宜和存储的成本也相对便宜。
2
The removal of dams remains controversial because of high restoration costs, loss of low-cost electricity, and the loss of water storage facilities.
大坝的拆除仍然存在争议，因为高重建成本，损失低成本电力，以及损失蓄水设施。
3
This includes the costof purchasing storage, the costof powering it, the costof repairing it (when drives fail), as well as the costof managing the storage.