尽管这是一个很简单的附加功能，但确实十分实用。
通过纵向思维，Lenssen博士生成一种彩色产品，虽然很简单，但很实用。
But by thinking laterally, Dr Lenssen has come up with a colourful product that, though simpler, is still useful.
也许上面的几种急救方法很简单，但很实用，我们应该学习更多的急救方法去帮助更多的人。
Perhaps the tops above are very simple. However they are very practical and useful. We should learn more methods to help more and more people.
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