Pir
abbr. 蛋白序列数据库（Protein Identification Resource）；聚三聚氰酸酯
🗣️ 情景例句
Help yourself, please.
请随便。
You walk so fast that I can't keep up with you.
你走得太快，我跟不上你。
I don't know. I think he's very old.
不知道。我想他年纪一定很大了。