Nafion
n. 全氟磺酸；电解质
🗣️ 情景例句
They have to be here.
它们肯定就在这儿。
Wit once bought is worth twice taught.
亲身一次的经验，抵得上老师两次的教导。
Tramps seem to be the only exception to this general rule.
在这条普遍的规律前面，