我记得曾经有一段时间在等著为一颗前牙加牙套。

I also remember a time when I was waiting to put on a crown over one of my front tooth .

但是，曾经有一段时间学者们认为女人和男人有很大差别。

There was a time, though, when scholars thought women were very different from men.

曾经有一段时间，最快的方式穿越美国西部是在一个公共马车。

There used to be a time when the quickest way to travel across the western United States was in a stagecoach .

曾经有一段时间，在史前时代，人们用来沟通的手势语言。

There was a time when during prehistoric times, people used to communicate in sign languages.

发展安利时,曾经有一段时间感到患得患失,对自己没有信心,阻碍了发展.

During my development period with Amway there was time when I lacked confidence and felt insecure.

曾经有一段时间，作家们可以通过演讲之类的兼职赚钱；马克·吐温（Mark Twain）就是通过巡回演讲使自己从破产的困境中解脱出来。

Time was when authors could make money from sidelines such as public speaking; Mark Twain pulled himself out of bankruptcy by going on the lecture circuit.