1) He died by drowning himself in the sea.

他投海自尽了。
2) He went over to the Liberals.

他投靠自由党了。
3) He drowned himself in a river.

他投河自杀了。
4) To hang oneself

投缳自尽
6) drown oneself in a river; throw oneself into a river to commit suicide

投河自尽
参考词条