Permaphase
带硅氧烷聚合物层的色谱固定相
🗣️ 情景例句
I really feel bad about it,
我真过意不去。
I know the boy whose father is a mailman.
我知道那个男孩的父亲是邮差。
This model's less expensive than that one.
这种型号比那种要便宜些。