Intrados
n. 拱腹(線), 拱之下面, 內弧面
??? 情景例句
What's on my schedule for today?
我今天有什么日程安排？
The remembrance of past sorrow is joyful.
記住過去的不幸使人愉快。
Before it becomes a retirement village,
在硅谷變成一個退休村之前，