A 增加的，额外的，另外的　 added; extra; supplementary

1. additional的基本意思是“增加的，额外的，另外的”，指在原有总数的基础上进行了添加，使其成为整体的补充。
2. additional不用于比较等级。

　～ charges　附加费

　An additional charge is made for heavy bags.　重的行李要额外收费。
　Mother needs additional help in the kitchen.　母亲还需要人帮厨。
　It will take additional two weeks to finish the work.　还得花两个星期才能完成这项工作。
　These are things additional.　这是一些附加的东西。
　This problem is additional to their major financial anxieties.　这道难题使他们的财政状况更加令人担忧。
　This problem is additional to my difficult situation.　这一问题加剧了我的困境。