Topocline
地理漸變群, 地區漸變群
??? 情景例句
I had a really bad day.
今天真是糟透了。
I'm looking for a permanent position.
我在找固定的工作。
Yes, Miss Zhao. answered the students. Now, who is on duty today?
“好的，趙小姐，”同學們回答。“今天誰值日？”