英语语法分析

Gagarin would have been his replacement.

加加林在这次任务中是他的替补。

Yuri Gagarin died in a plane crash in 1968.

尤里·加加林死于1968年的一次飞机坠毁事故。

One year earlier Gagarin died in a plane crash.

一年前，加加林死于空难。