If we manage to exercise every day for a considerable period of time , the habit would contribute invaluably to our health .

如果我们坚持在一段时间里每天锻炼，这个习惯对于我们健康的贡献将是无价的。

The computer is an invaluably remorseless master : harsh , sometimes to the point of causing you to tear your hair out , but never unfair .

计算机可以说是一位铁面无情的大师：严酷，有时甚至会让你抓狂，但绝对公平。