Dragendorff test
[化] 德拉根道夫试验(用碘化铋钾试验生物碱形成特性加成化合物的结晶)
🧩 词语组成解析
🗣️ 情景例句
I expect you to be punctual.
我希望你守时。
He who hesitates is lost.
举棋不定，坐失良机。
'I was just wondering how to spend the morning -- until I saw you.
“我正不知道怎么消磨这一上午呢，正好见到好。