Genocline
遺傳漸變群
??? 情景例句
Mr. Malcolm Stewart, and it looks like a personal letter.
Malcolm Stewart先生收 ，而且看來是一封私人信件。
I understand completely.
我完全理解。
It has to be tall because it is like a giant block and tackle,
井架必須很高，因為它像一個巨型滑輪組。