| 单词 | low-grade infection |
| 例句 | DEFINITIVE EXAMPLES 权威例句〔premunition〕Relative immunity to severe infection by a particular pathogen as a result of a chronic low-grade infection induced earlier by the same pathogen.传染免疫：由以前同一病原体所引起的慢性低度传染而造成的特定病原体对严重感染的相对免疫美国传统 |
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