Biochron
生物年代, 较短时期的化石, 生物时
🗣️ 情景例句
I said exactly the same thing to Grandpa.
我跟你爷爷说了同样的话。
She began playing the violin when she was nine.
九岁的时候，她开始拉小提琴。
I need your help.
我需要你的帮助。