Serogenesis
血清生成
🗣️ 情景例句
Hi, Susan.
嗨， Susan。
Is he the tall man on the left?
他是在左边上的高个吗？
Jim couldn't decide where to go for his holidays. He didn't go anywhere in the end.
几亩决定不了去哪渡假，最终他哪儿也没去。