单词 | 传染源 |
例句 | DEFINITIVE EXAMPLES 权威例句〔infection〕We are trying to trace the source of infection.我们正在努力查找传染源。牛津搭配〔source〕We have been unable to trace the source of the infection.我们还没有找到传染源。麦克米伦高阶 |
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