Diphenylbenzidine
二苯基联苯胺
🗣️ 情景例句
Something that might be surprising to you.
一件也许会让你吃惊的事。
After forty years teaching English he thinks it's time to call it a day.
他教英语四十年，认为该退休了。
But what else?
但它还传递别的什么呢？