Identification reaction
[化] 鉴定反应
🧩 词语组成解析
🗣️ 情景例句
How much does it weigh?
它多重？
In every beginning think of the end.
思前顾后。
always assuming,of course, that the sea is calm.
当然，这一切只有在大海风平浪静的情况下才有可能。