Ichthyopterygium
[医]鳍（型肢）
🗣️ 情景例句
It all sounds so easy.
一切听起来竟是如此简单。
What were you doing at about 4 o'clock yesterday afternoon?
你昨天下午在大约4点钟正在做什么？
Camping sites, by contrast, are highly cosmopolitan.
而露营驻地则相反，是高度世界性的。