Arlef
氟灭酸; 甲灭酸
🗣️ 情景例句
What are you afraid of?
你怕什么
The postman always comes at 2 o'clock.
邮递员总是在2点钟来。
When I present my views on the competitive products, I will refer to the patent situation.
专利的情况会在说明竞争产品时一并提出。