Protohippus
n. [古生](原产北美现已灭种的)原马
🗣️ 情景例句
You must observe these simple rules.
你必须遵守这些简单的规定。
John stopped studying.
约翰停止学业了。
We'll have to buy some more bricks. I don't think these will be enough.
我们需要买更多的砖。我认为这些不够。