Biconcavity
n. biconcave的变形
🗣️ 情景例句
I'd appreciate that.
谢谢你让我使用电话。
Please send your report to me at the office by Monday.
请于周一以前将报告送到我的办公室。
Well, I'm afraid we have to go now.
哦，恐怕我们现在得走了。