Scaling up involves upgrading the hardware or optimizing the software to ensure that a single server machine set can support more users.
向上扩展包括升级硬件或优化软件以确保单个服务器机组能够支持更多用户。
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For instance, scaling up an application using a larger virtual machine (VM) on Amazon Elastic Compute Cloud (EC2) can be a quick fix when large-scale computing power is needed right away.