Intrados
n. 拱腹(线), 拱之下面, 内弧面
🗣️ 情景例句
I feel rotten about not taking the children out.
我没有带孩子出去觉得很不痛快。
He always forgets to wash behind his ears.
他总是忘记洗耳朵后面。
I'm not sure how this works.
我不懂这是如何操作的。