Oncolite
藻灰結核; 核形石
??? 情景例句
If you go camping, at night you'll hear all the nocturnal animals.
如果你去野營，晚上可以聽到動物的夜歌。
What's so funny?
什么事那么好笑？
You see, it's easy. Run! Good!
你看，挺簡單的，跑起來，好！