Pellidon
多孔聚酰胺膜
🗣️ 情景例句
Hi, Mr. Baker. We met before.
嗨， Baker先生， 我们以前见过面。
I went to visit an uncle of mine in San Francisco.
我去旧金山看望一个叔叔。
The real dividing line between continents and oceans occurs at the foot of a steeper slope.
大陆和海洋的真正分界线是在陡坡脚大陆架慢坡