Nitrozation
亚硝化作用
🗣️ 情景例句
We want to keep customers happy.
我们必须让顾客满意。
Next week I must start my term paper for Poli Sci.
到下周，我必须着手写政治学的期末论文了。
She must be at least thirty-five years old.
她至少也有35岁了。