The driver was a trim young woman of perhaps thirty.
駕車(chē)者是一位大約三十來(lái)歲的苗條年輕女子。
If I might hazard a guess , I'd say she was about thirty.
讓我來(lái)猜的話，我說(shuō)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(dá)了頂峰。