Pir
abbr. 蛋白序列数据库（Protein Identification Resource）；聚三聚氰酸酯
🗣️ 情景例句
Why is that necessary?
为什么有此必要
You have a younger brother, don't you?
你有个弟弟，是吗？
What's in it?
里面是什么东西？