back up system
查询英语单词中文释义、音标、发音和例句。
back up system
英
[back up system]
美
[back up system]
中文释义
后援系统
单词分析
单词结构:
back up system
字母数:14
记忆提示
🎯 重点记忆:
- 单词拼写:back up system
- 核心含义:后援系统
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更新时间:2026-09-21 17:45:16