Permutoid
[化]交换体
🗣️ 情景例句
I was faced with a new problem.
我面临了新的问题。
Those flowers look pretty but don't give off a nice smell.
这些花看似漂亮，但是气味并不好。
I was proud that we had come across something that was completely unknown and valuable and,
让我感到自豪的是，我们在无意中发现了不为世人所知的、有价值的东西，