Mebor
硫酸铜, 硼酸混合物
🗣️ 情景例句
Is this your first trip to China?
这是你第一次到中国吗？
Pupil. He is studying.
学生。正在学习。
We've got to think of ways of changing people's habits.
我们得想想办法，改变人们的习惯。