There's no turning back.
依字面上來看,There's no turning back.就是“沒有退路”的意思,凡是遇到勢(shì)在必行,決定了就不能反悔的事情,都可以說There's no turning back.。說得文言一點(diǎn)就是“背水一戰(zhàn)”。