根的英語翻譯：

base; cause; foot; origin; radix; root; source
【化】 radical
【醫(yī)】 rad.; radical; radices; radix; rhizo-; root

尖的英語翻譯：

needle; piercing; point; sharp; the best of its kind; tip; top
【醫(yī)】 apex; apices; apico-; cusp; cuspis; mucro; point; puncta; punctum; tip

感染的英語翻譯：

affect; catch; communicate; contract; infect; taint
【醫(yī)】 contract; infect; infection; infest; infestation; inquination