Diphenylethlene
二苯基乙烯
🗣️ 情景例句
Yes. I have an upset stomach.
是的，我的胃很难受。
Home is home, though never so homely.
不如归去。
Even more processes are never patented at all but kept as secret processes.
更多的工艺过程根本就不会取得专利权，而是作为秘方保存着。