Sources of infection
[医] 传染源
🧩 词语组成解析
n. 输入源；发起者；来源（source的复数）
of
[əv]
prep. 关于;属于…的;由…制成;
aux. 助动词 [非标准用语、方言] =have [主用于虚拟语气];
infection
[in'fekʃən]
n. <医>传染，感染;传染病，染毒物;影响;
🗣️ 情景例句
Do you have anything to snack on?
有什么可吃的吗？
When did you find this book?
你什么时候找到这本书的？
It was very dark, so they turned on a torch.
饭厅很暗，于是他们打开了手电筒。