My friend was knocked down and could have been killed.As it was,he suffered severe back injuries. 我朋友被车撞了，差点死了，到现在只是背部受伤。这是新概念课本翻译。could have been killed为什么有差点被撞死的意思？后面As it was,he suffered severe back injuries.我理解是实际上他背部严重受伤了。和他的理解也有出入。