Quaternarization
[化] 季铵化作用; 门秀金反应
🗣️ 情景例句
When he came to the States five years ago, he had only forty dollars in his pocket.
五年前他来美国时，口袋里只有40美元。
Of young men die many, of old men escape not any.
年轻人死得不少，而年迈者是在劫难逃。
He seems a little nervous.
他显得有点紧张。