Tpps
[医][=tetraphenylporphinesulfonate]四苯基卟啉磺酸盐
🗣️ 情景例句
I was. I came back here last month on vacation.
本来是，不过上个月回来度假。
To examine the problem
检讨问题
The clouds had come down so suddenly we had no warning.
乌云突然出现，我们丝毫没有觉察。