Sigmatropic
n. [化]σ移位的,單鍵轉移的
??? 情景例句
They are constantly quarreling.
他們時常吵架。
It is easy to be wise after the event.
當事后諸葛亮容易。
As Earth-dwellers, we always cherish the hope that we will be visited by little green men and that we will be able to communicate with them.
小綠人來拜訪我們，而我們可以和他們交流。