2.Kennedy was struck down by an assassin’s bullet.
肯尼迪被刺客击中而身亡。
3.She was struck down by polio at the age of four.
她四岁那年因小儿麻痺症死去。
4.For a long time I knew how the day went, by the imperious clangour of midday and evening bells striking down upon the houses and the edge of the lake.