Ugb
[医][=undecalcified granulated bone]未脱钙（异体）骨颗粒
🗣️ 情景例句
And you never know
而你永远也猜不到
Excuse me I couldn't help you.
对不起我不能帮助你。
This decline in vigour with the passing of time is called ageing.
生命力随时间的流失而衰退叫做衰老。