单词：system upgrade
system upgrade的用法和样例：
例句
- You don't have to pay extra for the new OS or hassle with performing the upgrade.你不必为新版操作系统支付额外的费用，或者遭遇系统升级的种种麻烦。
- This type of design allows parts of the system to be upgraded without affecting the rest.这样的设计让部份的系统升级时不至于影响其他部份。
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