(每日一词）superfluous

Superfluous  /suːˈpɝː.flu.əs/ adj. 过多的，多余的，过剩的

meaning: more than is needed or wanted 

前缀：super-在..之上

词根：flu-流动

后缀：-ous 形容词后缀

e.g. The book was already lengthy, and the additional chapter seemed superfluous. 这本书已经很长了，又多了一章似乎有点多余。