Uba
abbr. undenatured bacterial antigen 非变性的细菌抗原
🗣️ 情景例句
It is.
是的。
Friends are like fiddle-strings,they must not be screwed too tight.
朋友有如琴弦，不能上的太紧。
and the existence of underwater features of considerable magnitude.
水下特征差异极大。