肯尼迪家族在美国历史上留下了深刻的印记。

The ___Kennedy family left a profound mark on American history.

肯尼迪在1961年发表了著名的登月演讲。

___Kennedy delivered the famous moon speech in 1961.

肯尼迪在1968年总统竞选期间遇刺身亡。

___Kennedy was assassinated during his 1968 presidential campaign.