Pliocene epoch
un. 上新世
🧩 词语组成解析
n. 上新世, 上新世岩
🗣️ 情景例句
This has been a hard course for me.
这门课对于我来说很难。
I don't know how to work the machine.
我不懂得怎样使这部机器运转。
I'm very sorry, but I can't come.
但很抱歉，我不能来。