The driver was a trim young woman of perhaps thirty.

　　駕車者是一位大約三十來歲的苗條年輕女子。

　　If I might hazard a guess , I'd say she was about thirty.

　　讓我來猜的話，我說她大約三十歲。

　　Yesterday no fewer than thirty climbers reached the summit.

　　昨天不少于三十名登山者到達了頂峰。