Hazen's theorem
[医] 黑曾氏定理(净化公共给水可减少因病死亡)
🧩 词语组成解析
🗣️ 情景例句
They're real watches. They tell you the time, don't they?
当然是"真的表"罗。会走也会报时，不是吗？
Are you going anywhere?
你打算上哪儿去玩？
There was no doubt that we were unwelcome visitors.
毫无疑问，我们的来访是不受欢迎的。