a long while ago的用法和樣例：
例句
- The lake was ponded by lavas a long time ago.
這條湖是很久以前熔巖堵塞河道形成的。 - She said she had seen the film long before.
她說(shuō)她很久以前就看過(guò)這部電影。 - In former days there was a racecourse here.
從前這兒有個(gè)賽馬場(chǎng)。 - In the old days,many families led a dog's life.
從前，許多家庭過(guò)著(zhù)牛馬不如的生活。
