Index of unsaturation
[機] 不飽和指數
?? 詞語組成解析
index
['?nd?ks]
n. 索引;<數>指數;指示;標志;
vt. 給…編索引;把…編入索引;[經濟學]按生活指數調整（工資、價格等）;
vi. [機械學]轉位;
in(in)+dex(proclaim)→指針；索引；指數；食指；指標
of
[?v]
prep. 關于;屬于…的;由…制成;
aux. 助動詞 [非標準用語、方言] =have [主用于虛擬語氣];
[機] 不飽和現象
??? 情景例句
As simple as that.
就這么簡單。
The mill cannot grind with the water that is past.
覆水難收。
How are you doing?
你好嗎？