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
Oh, you think you're going to have a hard time
你认为需要大费周折
What's your favorite song?
你最喜欢的歌曲是什么？
Hello, Wei Hua! Where are you going?
你好，魏华！上哪儿去呀？