Arsenionization
砷离子透入法
🗣️ 情景例句
Is room service available?
有房间服务吗？
This round table weighs about forty-five pounds.
这张圆桌子重大约45磅。
I would be very grateful for information about entry to your college.
若能寄给我贵校的入学申请材料我将十分感激。