Diplasiocoela
双凹亚目
🗣️ 情景例句
It's the world's largest island, but it's also the world's smallest continent.
它是世界上最大的岛屿，同时也是世界上最小的洲。
He is in conference.
他正在开会。
In the eerie silence of the cavern,
洞里有一种可怕的寂静，