藥英文：流行性感冒 Influenza Infection

flu [flu] 
流行性感冒

complication [͵kɑmplə`keʃən] 
併發症

vaccinate [`væksn͵et] 
接種疫苗

Influenza (flu) is a respiratory illness caused by influenza viruses that infect the nose, throat, and lungs. To reduce the risk from flu and its complications is to get vaccinated every year.
流行性感冒（流感）是一種由感染鼻子、喉嚨和肺部的流感病毒引起的呼吸道疾病。降低流感及其併發症風險的最佳方法是每年接種疫苗。