1.Governments around the world are taking steps to guard against the disease.
guard against 防止;提防
The armed forces were on high alert to guard against any retaliation.
武裝部隊保持高度警惕,以防發生任何報復行為 。
Be on your guard against pickpockets.
提防扒手 。
2.Lawrence Gostin is a law professor at Georgetown University who specializes in public health.
specialize in 專門研究……
She specializes in obstetrics.
她是產科專家 。
The cinema specializes in Italian films.
這家電影院專門放映意大利電影 。