| 单词 | 备用系统 |
| 例句 | DEFINITIVE EXAMPLES 权威例句〔function〕All the backup systems performed their function flawlessly.所有的备用系统都完美地发挥了作用。麦克米伦高阶〔trust〕You have to be able to have trust in your backup system.你要对自己的备用系统有信心。麦克米伦高阶 |
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