Pettenkofer's theory
[医] 佩滕科弗氏学说(病菌通过地下水传播疾病)
🧩 词语组成解析
🗣️ 情景例句
I need a haircur, what would you recommend?
我要剪个发，你有什么好建议？
After dinner, they adjourned to the study to talk.
晚饭后，他们到书房谈话去了。
At that time he had two helpers.
那时他有两个帮手。