Pallidin
梅毒螺旋体素, 苍白密旋体素
🗣️ 情景例句
I'm just being a grandfather.
我只是在尽一个爷爷的本份而已。
This part of the country is very mountainous.
这个国家这一部分有很多山。
Had it not been for the alarm clock she wouldn't have been late.
如果不是因为闹钟不响的话，她就不会迟到了。