Biconcave
a. 双凹的\\n[医] 双凹[形]的
🏥 医学释义
双凹面的，双凹（形）的
🗣️ 情景例句
It makes a tremendous difference to me.
这对我来说差别极大。
That's very nice of you. I guess I could use some help.
谢谢你的好意。我想我可能要一点帮助。
Over the years, one may well become a authority on one's hobby and will very probably be asked to give informal talks to little gatherings and then,
一人积了多年经验会成为自己这种爱好的权威，很可能应邀在小型集会上作非正式的讲话。