您可以选择重用资源，或者直到需要时再购买资源，但是不再需要保留备用容量 “以防万一”。
The choice of whether to reuse or not pay until you need the resources is now yours, but you no longer need to have the spare capacity there, waiting for the "just in case" situation to occur.
调查发现，平均而言，管理员分配70%的服务器的内存给虚拟机(VMs)，保留30%作为备用。
The survey found that, on average, administrators allocate 70% of a server's RAM to virtual machines (VMs), leaving 30% in reserve.
电力公司总是保留一些备用发电能力，而在这用电需求突然下降的一个小时中，供电公司的涡轮发电机会继续工作，为一小时后的用电新高峰做准备。
Power companies always keep spare capacity and will keep their turbines spinning through this unpredictable fall in demand in preparation for when people turn their lights back on again.
当你在职业生涯中执行你的A计划时，记得也保留计划B——一个你可以依靠的备用计划。
As you move along Plan a of your career, maintain a Plan B as well -an alternative course to rely.
如果配置备用转储设备来使用备用磁盘，那么要使用migratepv将它的LP转移到保留的磁盘或者不配置备用转储设备。
If a secondary dump device is configured to use the secondary disk, move its LPs to the remaining disk using migratepv or unconfigure the secondary dump device.
自行车运动员把力量保留起来，准备用在最后一圈超过对手。
The cyclist is reserving his strength for the last round when he will gain on his opponent.
现金是银行的备用金，没有任何收益，还要花费很大的代价去贮存，保管和运送，因此，银行尽可能保留极少的现金。
Cash is a banker's stock in trade but it earns nothing and costs him a great deal to store, safeguard and transport, so he will keep as little of it as he can.
银行保留有一笔很大的备用金。
请保留在MIV上游管的设备用于水道的排污。
请保留在MIV上游管的设备用于水道的排污。
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