Botulin
[微]肉毒桿菌毒素
??? 情景例句
Please excuse me for a minute.
失陪一會(huì)兒。
You give me the money. I'll get you the goods.
一手交錢，一手交貨。
only of metal, which wears away by friction.
而是由金屬組成，而金屬可以隨著磨擦而磨損殆盡。