问答题 All time is precious; but the time of our childhood and of our youth is more precious than any other portion of our existence. For those are the periods when alone we can acquire knowledge and develop our capacities. If we allow these morning hours of life to slip away, we shall never be able to recoup the loss. Just as money laid out at interest doubles and trebles itself in time, so the precious hours of childhood and youth, if properly used, will yield us incalculable advantages.