Nitrolignin
硝化木素
🗣️ 情景例句
Will you be all right?
你不会有问题吧？
I know the boy whose father is a manager.
我知道那个男孩的父亲是经理。
My parents used to live in South America and I used to fly there from Europe in the holidays.
我的父母曾经住在南美洲，所以假期里我常从欧洲乘飞机到他们那里。