| 单词 | opportunistic infection |
| 释义 | opportunistic infection specialized noun countable ■an infection caused by bacteria or a virus which is not harmful to a healthy person but harms a person whose body's natural defence against infection is damaged 机会性感染（细菌或病毒引起的感染，对健康的人无害，但对自然防御感染能力受损的人有害） |
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