Sadd
(白尼罗河上游的)大块漂浮植物
🗣️ 情景例句
I heard the professor of that class is very good.
我听说那个班的教授很好。
No, she isn't.
不，她不是。
For example, you can send information abroad immediately, but mailing a letter might take a week or so.
例如，你能够马上发送信息到国外，但寄一封信可能要大约一周的时间。