(每日一词）deleterious

Deleterious  /ˌdel.ɪˈtɪr.i.əs/ adj. 有害的，造成危害的

meaning: Something that has a deleterious effect on something has a harmful effect on it. 有害的

1） 词汇：delete 删除

2）后缀；-er 名词后缀；-ous 形容词后缀

e.g. The deleterious effects of smoking on one's health are well-documented. 吸烟对健康的有害影响已经有充分的证据。