Scaup
n. 斑背潜鸭
🗣️ 情景例句
Is there a limit to how many I can purchase at this price?
我买这种东西在数量上有什么限制吗？
Don't speak all you know, but know all you speak.
不要尽言所知，而要尽知所言。
I am not sure such data does exist.
我不确定是否有这样的资料存在。