He kept his head,__ otherwise __ the accident would have hap

【原句】
He kept his head,otherwise the accident would have happened.
【翻译】
他很冷静,否则就发生车祸了.
【otherwise用法】
otherwise＝if he hadn't kepe his head
属于含蓄条件句的虚拟语气用法
【例证】
非真实条件句中的条件从句有时候不表达出来,只是暗含在上下文中.
如：We didn’t know his telephone number; otherwise we would have telephoned him.
我们不知道他的电话号码,否则我们就会给他打电话.（暗含条件otherwise）
Without your help,we wouldn’t have achieved so much.
没有你的帮助,我们不可能取得这么大的成绩.（暗含条件without your help）
But for your help,I would not have succeeded in the experiment.
如果没有你的帮助,我的实验就不会成功.（暗含条件But for your help）
Given the opportunity,he might have become a famous singer.
如果给他提供机会的话,他很可能已经成为著名歌唱家了.（暗含条件Given the opportunity）