Transanhydrisation
酐交换作用
🗣️ 情景例句
But Christmas is the most important holiday of the year.
但是圣诞节是一年当中最重要的节日。
What number are you calling?
你打什么号码？
only of metal, which wears away by friction.
而是由金属组成，而金属可以随着磨擦而磨损殆尽。