依次按一定比例加入硫酸铝的翻译：Followed by proportionally adding aluminium sulphate 什么意思？中文翻译英文，英文翻译中文，怎么说？

青云英语翻译

Followed by a certain percentage of aluminum sulfate

Followed by proportionally adding aluminium sulphate

Presses certain proportion to join the aluminium sulfate in turn

According to a certain ratio followed by adding aluminum sulphate

Followed by proportionally adding aluminium sulphate